CVE-2026-1637 HIGH

CVE-2026-1637: Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow

Vendor Tenda
Product AC21
Weakness CWE-121
Published January 29, 2026
Last update February 23, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

Key dates

02Disclosure timeline

January 29, 2026 CVE published
February 23, 2026 Record updated