# CVE-2021-31755

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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-31755
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17
- EPSS: 86.51% (percentile 99.7)
- Detection templates only, no public exploit found: 1 Nuclei template
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-02-04)
- Weakness: CWE-787
- Published: 2021-05-07

## Affected

- tenda:ac11_firmware

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.