Read the docs
TI-2021-11773 Aliases CVE-2021-31756GHSA-cm66-w4c7-wx9w

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN.

Priority MEDIUM 47CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /gofrom/setwanType allows attackers to execute arbitrary code on the system via a crafted post request. This occurs when input vector controlled by malicious attack get copied to the stack variable.

Why it matters now

EPSS 0.02905 87th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tenda:ac11_firmware:*:*:*:*:*:*:*:*up to 02.03.01.104_cnVulnerableTenda
cpe:2.3:h:tenda:ac11:-:*:*:*:*:*:*:*not specified by NVDRunning onTenda
  • cpe:2.3:o:tenda:ac11_firmware:*:*:*:*:*:*:*:* Versions up to 02.03.01.104_cn Vulnerable ·Tenda
  • cpe:2.3:h:tenda:ac11:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Tenda

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-31756
  2. 2026-10-03 Alias added: GHSA-cm66-w4c7-wx9w

References

Exploit 1

  • TI-2021-11772 An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-11775 An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. CVSS 3.1CRITICAL 9.8
  • TI-2021-11774 An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. CVSS 3.1CRITICAL 9.8
  • TI-2021-21157 Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer… CVSS 3.1CRITICAL 9.8
  • TI-2021-21141 Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer… CVSS 3.1CRITICAL 9.8
  • TI-2021-21140 Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer… CVSS 3.1CRITICAL 9.8
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences