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Critical severity · published Sep 1, 2025
CVE-2025-9791
Tenda AC20 fromAdvSetMacMtuWan stack-based overflow
9.8
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
AC20 · Tenda
16.03.08.05 · source: vendor
AF
Ac20 Firmware · Tenda
16.03.08.5 · source: NVD
Affected product
AC
AC20
Tenda
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-9791
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-9791
Exploit
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md
Exploit
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc
Permissions Required
https://vuldb.com/?ctiid.322106
Third Party Advisory
https://vuldb.com/?id.322106
Third Party Advisory
https://vuldb.com/?submit.641088
Product
https://www.tenda.com.cn/
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