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URL: https://nvd.nist.gov/vuln/detail/CVE-2021-31755

⇱ NVD - CVE-2021-31755

  1. Vulnerabilities

CVE-2021-31755 Detail

Description

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setmac allows attackers to execute arbitrary code on the system via a crafted post request.


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)
https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 CVE, MITRE Broken Link  Exploit  Issue Tracking  Third Party Advisory 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755 CISA-ADP US Government Resource 

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
Tenda AC11 Router Stack Buffer Overflow Vulnerability 11/03/2021 11/17/2021 Apply updates per vendor instructions.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write 👁 cwe source acceptance level
NIST   CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Denotes Vulnerable Software
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Change History

11 change records found show changes

CVE Modified by CISA-ADP 6/16/2026 11:52:12 PM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2025-02-04T19:44:13.561933Z","id":"CVE-2021-31755","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by MITRE 6/16/2026 11:52:12 PM

Action Type Old Value New Value
Added Affected 
[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]

Modified Analysis by NIST 11/10/2025 9:42:36 AM

Action Type Old Value New Value
Added Reference Type 
CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755 Types: US Government Resource

CVE Modified by CISA-ADP 10/21/2025 8:17:36 PM

Action Type Old Value New Value
Added Reference 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755

CVE Modified by CISA-ADP 10/21/2025 4:18:35 PM

Action Type Old Value New Value
Removed Reference 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755

CVE Modified by CISA-ADP 10/21/2025 3:19:06 PM

Action Type Old Value New Value
Added Reference 
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755

Modified Analysis by NIST 4/03/2025 3:15:01 PM

Action Type Old Value New Value
Changed Reference Type 
CVE: https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 Types: Exploit, Issue Tracking, Third Party Advisory


 
CVE: https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 Types: Broken Link, Exploit, Issue Tracking, Third Party Advisory
Changed Reference Type 
MITRE: https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 Types: Exploit, Issue Tracking, Third Party Advisory


 
MITRE: https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 Types: Broken Link, Exploit, Issue Tracking, Third Party Advisory

CVE Modified by CISA-ADP 2/04/2025 3:15:42 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
Added CWE 
CWE-787

CVE Modified by CVE 11/21/2024 1:06:10 AM

Action Type Old Value New Value
Added Reference 
https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3

CVE Modified by MITRE 5/14/2024 5:01:39 AM

Action Type Old Value New Value

Initial Analysis by NIST 5/10/2021 10:57:33 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:H/A:H
Added CVSS V2 
NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Added CWE 
NIST CWE-787
Added CPE Configuration 
AND
 OR
 *cpe:2.3:o:tenda:ac11_firmware:*:*:*:*:*:*:*:* versions up to (including) 02.03.01.104_cn
 OR
 cpe:2.3:h:tenda:ac11:-:*:*:*:*:*:*:*
Changed Reference Type 
https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 No Types Assigned


 
https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 Exploit, Issue Tracking, Third Party Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-31755
NVD Published Date:
05/07/2021
NVD Last Modified:
06/16/2026
Source:
MITRE