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URL: https://nvd.nist.gov/vuln/detail/CVE-2021-20837

⇱ NVD - CVE-2021-20837

  1. Vulnerabilities

CVE-2021-20837 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

Movable Type 7 r.5002 and earlier (Movable Type 7 Series), Movable Type 6.8.2 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.5002 and earlier (Movable Type Advanced 7 Series), Movable Type Advanced 6.8.2 and earlier (Movable Type Advanced 6 Series), Movable Type Premium 1.46 and earlier, and Movable Type Premium Advanced 1.46 and earlier allow remote attackers to execute arbitrary OS commands via unspecified vectors. Note that all versions of Movable Type 4.0 or later including unsupported (End-of-Life, EOL) versions are also affected by this vulnerability.


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

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URL Source(s) Tag(s)
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html CVE, JPCERT/CC Exploit  Third Party Advisory  VDB Entry 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html CVE, JPCERT/CC Third Party Advisory  VDB Entry 
https://jvn.jp/en/jp/JVN41119755/index.html CVE, JPCERT/CC Third Party Advisory 
https://movabletype.org/news/2021/10/mt-782-683-released.html CVE, JPCERT/CC Release Notes  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') 👁 cwe source acceptance level
NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Denotes Vulnerable Software
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Change History

9 change records found show changes

CVE Modified by JPCERT/CC 6/16/2026 11:34:31 PM

Action Type Old Value New Value
Added Affected 
[{"vendor":"Six Apart Ltd.","product":"Movable Type","versions":[{"version":"Movable Type 7 r.5002 and earlier (Movable Type 7 Series), Movable Type 6.8.2 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.5002 and earlier (Movable Type Advanced 7 Series), Movable Type Advanced 6.8.2 and earlier (Movable Type Advanced 6 Series), Movable Type Premium 1.46 and earlier, and Movable Type Premium Advanced 1.46 and earlier","status":"affected"}]}]

CVE Modified by CVE 11/21/2024 12:47:15 AM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html
Added Reference 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html
Added Reference 
https://jvn.jp/en/jp/JVN41119755/index.html
Added Reference 
https://movabletype.org/news/2021/10/mt-782-683-released.html

CVE Modified by JPCERT/CC 5/14/2024 4:06:56 AM

Action Type Old Value New Value

Modified Analysis by NIST 11/28/2021 6:11:45 PM

Action Type Old Value New Value
Changed Reference Type 
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html No Types Assigned


 
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html Exploit, Third Party Advisory, VDB Entry
Changed Reference Type 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html No Types Assigned


 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html Third Party Advisory, VDB Entry

CVE Modified by JPCERT/CC 11/17/2021 5:17:37 PM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html [No Types Assigned]
Added Reference 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html [No Types Assigned]

CVE Modified by JPCERT/CC 11/09/2021 8:16:17 PM

Action Type Old Value New Value
Removed Reference 
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html [No Types Assigned]
Removed Reference 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html [No Types Assigned]

CVE Modified by JPCERT/CC 11/09/2021 3:15:16 PM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164818/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html [No Types Assigned]

CVE Modified by JPCERT/CC 10/29/2021 2:15:07 PM

Action Type Old Value New Value
Added Reference 
http://packetstormsecurity.com/files/164705/Movable-Type-7-r.5002-XMLRPC-API-Remote-Command-Injection.html [No Types Assigned]

Initial Analysis by NIST 10/28/2021 2:17:27 PM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added CVSS V2 
NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Added CWE 
NIST CWE-78
Added CPE Configuration 
OR
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:* versions up to (including) 1.46
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:* versions up to (including) 1.46
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (including) 6.3.11
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:* versions from (including) 6.5.0 up to (including) 6.8.2
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* versions from (including) 6.5.0 up to (including) 6.8.2
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:* versions from (including) 7.0 up to (including) 7.8.1
 *cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* versions from (including) 7.0 up to (including) 7.8.1
Changed Reference Type 
https://jvn.jp/en/jp/JVN41119755/index.html No Types Assigned


 
https://jvn.jp/en/jp/JVN41119755/index.html Third Party Advisory
Changed Reference Type 
https://movabletype.org/news/2021/10/mt-782-683-released.html No Types Assigned


 
https://movabletype.org/news/2021/10/mt-782-683-released.html Release Notes, Vendor Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-20837
NVD Published Date:
10/26/2021
NVD Last Modified:
06/16/2026
Source:
JPCERT/CC