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URL: https://nvd.nist.gov/vuln/detail/CVE-2021-41773

⇱ NVD - CVE-2021-41773

  1. Vulnerabilities

CVE-2021-41773 Detail

Description

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL Source(s) Tag(s)
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html Apache Software Foundation, CVE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html Apache Software Foundation, CVE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html Apache Software Foundation, CVE Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Apache Software Foundation, CVE Exploit  Third Party Advisory  VDB Entry 
http://www.openwall.com/lists/oss-security/2021/10/05/2 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/07/1 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/07/6 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/1 Apache Software Foundation, CVE Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/2 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/3 Apache Software Foundation, CVE Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/4 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/5 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/08/6 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/09/1 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/11/4 Apache Software Foundation, CVE Mailing List  Patch  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/15/3 Apache Software Foundation, CVE Mailing List  Patch  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/10/16/1 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
https://httpd.apache.org/security/vulnerabilities_24.html Apache Software Foundation, CVE Release Notes  Vendor Advisory 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E Apache Software Foundation, CVE Mailing List  Patch 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E Apache Software Foundation, CVE Mailing List 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E Apache Software Foundation, CVE Mailing List 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E Apache Software Foundation, CVE Mailing List 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E Apache Software Foundation, CVE Mailing List 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ Apache Software Foundation, CVE Release Notes 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ Apache Software Foundation, CVE Release Notes 
https://security.gentoo.org/glsa/202208-20 Apache Software Foundation, CVE Third Party Advisory 
https://security.netapp.com/advisory/ntap-20211029-0009/ Apache Software Foundation, CVE Third Party Advisory 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ Apache Software Foundation, CVE Third Party Advisory 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41773 CISA-ADP US Government Resource 
https://www.oracle.com/security-alerts/cpujan2022.html Apache Software Foundation, CVE Patch  Third Party Advisory 

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name Date Added Due Date Required Action
Apache HTTP Server Path Traversal Vulnerability 11/03/2021 11/17/2021 Apply updates per vendor instructions.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') 👁 cwe source acceptance level
NIST   Apache Software Foundation  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

42 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 12:08:53 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2025-02-04T14:41:10.766482Z","id":"CVE-2021-41773","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by Apache Software Foundation 6/17/2026 12:08:53 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"Apache Software Foundation","product":"Apache HTTP Server","versions":[{"version":"Apache HTTP Server 2.4 2.4.49","status":"affected"}]}]

Modified Analysis by NIST 2/17/2026 2:49:26 PM

Action Type Old Value New Value
Added CVSS V3.1 
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Removed CVSS V3.1 
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Modified Analysis by NIST 10/27/2025 1:36:57 PM

Action Type Old Value New Value
Added Reference Type 
CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41773 Types: US Government Resource

CVE Modified by CISA-ADP 10/21/2025 8:17:46 PM

Action Type Old Value New Value
Added Reference 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41773

CVE Modified by CISA-ADP 10/21/2025 4:18:48 PM

Action Type Old Value New Value
Removed Reference 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41773

CVE Modified by CISA-ADP 10/21/2025 3:19:23 PM

Action Type Old Value New Value
Added Reference 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41773

Modified Analysis by NIST 3/21/2025 5:07:31 PM

Action Type Old Value New Value

CVE Modified by CISA-ADP 2/04/2025 10:15:13 AM

Action Type Old Value New Value
Added CVSS V3.1 
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVE Modified by CVE 11/21/2024 1:26:44 AM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html
Added Reference 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html
Added Reference 
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html
Added Reference 
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/05/2
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/07/1
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/07/6
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/1
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/2
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/3
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/4
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/5
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/6
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/09/1
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/11/4
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/15/3
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/16/1
Added Reference 
https://httpd.apache.org/security/vulnerabilities_24.html
Added Reference 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E
Added Reference 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E
Added Reference 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E
Added Reference 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E
Added Reference 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E
Added Reference 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/
Added Reference 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/
Added Reference 
https://security.gentoo.org/glsa/202208-20
Added Reference 
https://security.netapp.com/advisory/ntap-20211029-0009/
Added Reference 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ
Added Reference 
https://www.oracle.com/security-alerts/cpujan2022.html

Modified Analysis by NIST 7/26/2024 3:40:13 PM

Action Type Old Value New Value
Changed Reference Type 
https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory


 
https://httpd.apache.org/security/vulnerabilities_24.html Release Notes, Vendor Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E Mailing List, Patch
Changed Reference Type 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E Mailing List
Changed Reference Type 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E Mailing List
Changed Reference Type 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E Mailing List
Changed Reference Type 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E Mailing List
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ Release Notes
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ Release Notes

CVE Modified by Apache Software Foundation 5/14/2024 5:29:26 AM

Action Type Old Value New Value

CVE Modified by Apache Software Foundation 11/06/2023 10:39:00 PM

Action Type Old Value New Value
Added Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E [No types assigned]
Added Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3E [No types assigned]
Added Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E [No types assigned]
Added Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3E [No types assigned]
Added Reference 
Apache Software Foundation https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E [No types assigned]
Added Reference 
Apache Software Foundation https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ [No types assigned]
Added Reference 
Apache Software Foundation https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ [No types assigned]
Removed Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E
Removed Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E
Removed Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E
Removed Reference 
Apache Software Foundation https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E
Removed Reference 
Apache Software Foundation https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E
Removed Reference 
Apache Software Foundation https://lists.fedoraproject.org/archives/list/[email protected]/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/
Removed Reference 
Apache Software Foundation https://lists.fedoraproject.org/archives/list/[email protected]/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/

Modified Analysis by NIST 10/28/2022 12:16:21 PM

Action Type Old Value New Value
Changed Reference Type 
https://security.gentoo.org/glsa/202208-20 No Types Assigned


 
https://security.gentoo.org/glsa/202208-20 Third Party Advisory

CVE Modified by Apache Software Foundation 8/15/2022 7:15:30 AM

Action Type Old Value New Value
Added Reference 
https://security.gentoo.org/glsa/202208-20 [No Types Assigned]

Modified Analysis by NIST 3/25/2022 2:22:13 PM

Action Type Old Value New Value
Added CPE Configuration 
OR
 *cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
Added CPE Configuration 
OR
 *cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
 *cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
 *cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
Changed Reference Type 
https://www.oracle.com/security-alerts/cpujan2022.html No Types Assigned


 
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory

CVE Modified by Apache Software Foundation 2/07/2022 11:16:29 AM

Action Type Old Value New Value
Added Reference 
https://www.oracle.com/security-alerts/cpujan2022.html [No Types Assigned]

Modified Analysis by NIST 11/30/2021 3:18:04 PM

Action Type Old Value New Value
Added CPE Configuration 
OR
 *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
 *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Changed Reference Type 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html Exploit, Third Party Advisory


 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
Changed Reference Type 
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html No Types Assigned


 
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
Changed Reference Type 
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html No Types Assigned


 
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/07/1 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/07/1 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/07/6 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/07/6 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/1 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/08/1 Exploit, Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/2 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/08/2 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/3 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/08/3 Exploit, Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/4 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/08/4 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/5 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/08/5 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/6 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/08/6 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/09/1 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/09/1 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/11/4 Third Party Advisory


 
http://www.openwall.com/lists/oss-security/2021/10/11/4 Mailing List, Patch, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/15/3 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/15/3 Mailing List, Patch, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/16/1 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/16/1 Mailing List, Third Party Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E Mailing List, Vendor Advisory


 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E Mailing List, Patch, Vendor Advisory
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/[email protected]/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/[email protected]/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ Mailing List, Third Party Advisory
Changed Reference Type 
https://lists.fedoraproject.org/archives/list/[email protected]/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ No Types Assigned


 
https://lists.fedoraproject.org/archives/list/[email protected]/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ Mailing List, Third Party Advisory
Changed Reference Type 
https://security.netapp.com/advisory/ntap-20211029-0009/ No Types Assigned


 
https://security.netapp.com/advisory/ntap-20211029-0009/ Third Party Advisory

CVE Modified by Apache Software Foundation 11/11/2021 12:15:07 PM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html [No Types Assigned]

CVE Modified by Apache Software Foundation 10/29/2021 9:15:09 AM

Action Type Old Value New Value
Added Reference 
https://security.netapp.com/advisory/ntap-20211029-0009/ [No Types Assigned]

CVE Modified by Apache Software Foundation 10/25/2021 3:15:09 PM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html [No Types Assigned]

CVE Modified by Apache Software Foundation 10/16/2021 5:15:08 AM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/16/1 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/15/2021 5:15:08 PM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/15/3 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/14/2021 11:15:06 PM

Action Type Old Value New Value
Added Reference 
https://lists.fedoraproject.org/archives/list/[email protected]/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ [No Types Assigned]

CVE Modified by Apache Software Foundation 10/12/2021 10:15:10 PM

Action Type Old Value New Value
Added Reference 
https://lists.fedoraproject.org/archives/list/[email protected]/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ [No Types Assigned]

Initial Analysis by NIST 10/12/2021 11:43:01 AM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added CVSS V2 
NIST (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Added CWE 
NIST CWE-22
Added CPE Configuration 
OR
 *cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
Changed Reference Type 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html No Types Assigned


 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html Exploit, Third Party Advisory
Changed Reference Type 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html No Types Assigned


 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html Exploit, Third Party Advisory, VDB Entry
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/05/2 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/05/2 Mailing List, Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/07/1 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/07/1 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/07/6 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/07/6 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/1 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/08/1 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/2 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/08/2 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/3 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/08/3 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/4 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/08/4 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/5 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/08/5 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/08/6 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/08/6 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/09/1 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/09/1 Third Party Advisory
Changed Reference Type 
http://www.openwall.com/lists/oss-security/2021/10/11/4 No Types Assigned


 
http://www.openwall.com/lists/oss-security/2021/10/11/4 Third Party Advisory
Changed Reference Type 
https://httpd.apache.org/security/vulnerabilities_24.html No Types Assigned


 
https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E Mailing List, Vendor Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E Mailing List, Vendor Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E Mailing List, Vendor Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E Mailing List, Vendor Advisory
Changed Reference Type 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E No Types Assigned


 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E Mailing List, Vendor Advisory
Changed Reference Type 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ No Types Assigned


 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ Third Party Advisory

CVE Modified by Apache Software Foundation 10/11/2021 11:15:07 AM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/11/4 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/11/2021 6:15:07 AM

Action Type Old Value New Value
Changed Description 
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the expected document root. If files outside of the document root are not protected by "require all denied" these requests can succeed. Additionally this flaw could leak the source of interpreted files like CGI scripts. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions.


 
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

CVE Modified by Apache Software Foundation 10/09/2021 5:15:07 PM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/5 [No Types Assigned]
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/6 [No Types Assigned]
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/09/1 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/08/2021 8:15:07 PM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/3 [No Types Assigned]
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/4 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/08/2021 5:15:07 PM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/2 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/08/2021 10:15:08 AM

Action Type Old Value New Value
Added Reference 
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E [No Types Assigned]

CVE Modified by Apache Software Foundation 10/08/2021 5:15:08 AM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/08/1 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/07/2021 7:15:08 PM

Action Type Old Value New Value
Added Reference 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ [No Types Assigned]

CVE Modified by Apache Software Foundation 10/07/2021 2:15:08 PM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/07/6 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/07/2021 1:15:08 PM

Action Type Old Value New Value
Added Reference 
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E [No Types Assigned]
Added Reference 
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E [No Types Assigned]

CVE Modified by Apache Software Foundation 10/07/2021 11:15:10 AM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html [No Types Assigned]

CVE Modified by Apache Software Foundation 10/07/2021 8:15:07 AM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/07/1 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/06/2021 1:15:08 PM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html [No Types Assigned]

CVE Modified by Apache Software Foundation 10/05/2021 11:15:07 AM

Action Type Old Value New Value
Added Reference 
http://www.openwall.com/lists/oss-security/2021/10/05/2 [No Types Assigned]

CVE Modified by Apache Software Foundation 10/05/2021 9:15:08 AM

Action Type Old Value New Value
Added Reference 
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E [No Types Assigned]

CVE Modified by Apache Software Foundation 10/05/2021 8:15:08 AM

Action Type Old Value New Value
Added Reference 
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E [No Types Assigned]

Quick Info

CVE Dictionary Entry:
CVE-2021-41773
NVD Published Date:
10/05/2021
NVD Last Modified:
06/17/2026
Source:
Apache Software Foundation