CVE-2026-1637: high-severity vulnerability in Tenda AC21
Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.7%
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.
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
Affected products
Tenda · AC21Related CVEs — Tenda AC21
In the same product, most dangerous first.
CVE-2025-9605CRITICALTenda AC21/AC23 GetParentControlInfo stack-based overflowEPSS 6.0%CVE-2025-13446HIGHTenda AC21 SetSysTimeCfg stack-based overflowEPSS 4.2%CVE-2025-13445HIGHTenda AC21 SetIpMacBind stack-based overflowEPSS 4.2%CVE-2026-1638MEDIUMTenda AC21 mDMZSetCfg command injectionEPSS 2.2%CVE-2025-10838HIGHTenda AC21 WifiExtraSet sub_45BB10 buffer overflowEPSS 1.1%CVE-2026-4565HIGHTenda AC21 SetNetControlList formSetQosBand buffer overflowEPSS 1.0%