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CVE-2021-31755: Tenda AC11 Router Stack Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2021-31755
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Tenda AC11 devices contain a stack buffer overflow vulnerability in /goform/setmac which allows attackers to execute code via a crafted post request.

CSIRTS triage

vendor: Tendaproduct: AC11 RouterRemote code execution
What
Tenda AC11 devices contain a stack buffer overflow vulnerability that allows attackers to execute code via a crafted post request.
Who is affected
Deployments of Tenda AC11 devices.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest firmware update from Tenda.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-31755coverage & exploitation statusNVD · CVE.org

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