CVE-2021-31755

9.8 criticalKEVEPSS 87%

Critical (9.8) in Tenda AC11 Router. In CISA KEV since 2021-11-03. EPSS 87% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 87% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2021-11-03, due 2021-11-17
CWE: CWE-787
Published: 2021-05-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

tenda:ac11_firmware

References

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

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