What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 86.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-07 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Tenda Ac11 Firmware: through 02.03.01.104_cn

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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