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TI-2026-03969 Aliases CVE-2026-4565GHSA-mcx9-w62j-hjwr

Tenda AC21 SetNetControlList formSetQosBand buffer overflow

Priority MEDIUM 41CWE-119Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A vulnerability was detected in Tenda AC21 16.03.08.16. Impacted is the function formSetQosBand of the file /goform/SetNetControlList. Performing a manipulation of the argument list results in buffer overflow. The attack can be initiated remotely. The exploit is now public and may be used.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00954 61st percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TendaAC2116.03.08.16—No fix listedCNA
  • AC21 VendorTenda Affected 16.03.08.16 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tenda:ac21_firmware:16.03.08.16:*:*:*:*:*:*:*16.03.08.16VulnerableTenda
cpe:2.3:h:tenda:ac21:1.0:*:*:*:*:*:*:*1.0Running onTenda
  • cpe:2.3:o:tenda:ac21_firmware:16.03.08.16:*:*:*:*:*:*:* Versions 16.03.08.16 Vulnerable ·Tenda
  • cpe:2.3:h:tenda:ac21:1.0:*:*:*:*:*:*:* Versions 1.0 Running on ·Tenda

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4565
  2. 2026-10-03 Alias added: GHSA-mcx9-w62j-hjwr

References

Exploit 2

Other 1

  • TI-2025-08798 Tenda AC21/AC23 GetParentControlInfo stack-based overflow CVSS 4.0CRITICAL 9.3
  • TI-2026-01322 Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow CVSS 4.0HIGH 8.7
  • TI-2025-12293 Tenda AC21 SetSysTimeCfg stack-based overflow CVSS 4.0HIGH 8.7
  • TI-2025-12292 Tenda AC21 SetIpMacBind stack-based overflow CVSS 4.0HIGH 8.7
  • TI-2025-11565 Tenda AC21 SetPptpServerCfg formSetPPTPServer buffer overflow CVSS 4.0HIGH 8.7
  • TI-2025-10159 Tenda AC21 SetStaticRouteCfg sscanf buffer overflow CVSS 4.0HIGH 8.7
See all 28 →

Sources

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