Reference page — cumulative record through Tuesday, October 20, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-31755

CVE-2021-31755CRITICAL

n/a n/a — Tenda AC11 Router

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .8651   99.7   YES

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Apr 23  Reserved by mitre
  May 7   Published (CNA: mitre)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-787 · CNA: mitre · CVSS v3.1 · 2 references · KEV due November 17, 2021

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 23, 2021	Reserved	Reserved by mitre
May 7, 2021	Published	Published (CNA: mitre)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-11-17

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-787

References (2)

https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755 [government-resource]

Authoritative record: CVE-2021-31755 at cve.org

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-31755 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Tuesday, October 20, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.