CVE-2025-9791: Tenda AC20 fromAdvSetMacMtuWan stack-based overflow

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-09-01 · updated 2026-09-26
Weakness: CWE-119

Description

A weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability affects unknown code of the file /goform/fromAdvSetMacMtuWan. This manipulation of the argument wanMTU causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be exploited.

Affected products

Tenda AC20: 16.03.08.5

References

https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc
https://vuldb.com/?ctiid.322106
https://vuldb.com/?id.322106
https://vuldb.com/?submit.641088
https://www.tenda.com.cn/
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc

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