CVE-2025-8939

A vulnerability was determined in Tenda AC20 up to 16.03.08.12. Affected is an unknown function of the file /goform/WifiGuestSet. The manipulation of the argument shareSpeed leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

• CWE-119
• CWE-120

• https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.mdExploit, Third Party Advisory
• https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md#3-pocExploit, Third Party Advisory
• https://vuldb.com/?ctiid.319902Permissions Required, VDB Entry
• https://vuldb.com/?id.319902Third Party Advisory, VDB Entry
• https://vuldb.com/?submit.631829Third Party Advisory, VDB Entry
• https://www.tenda.com.cn/Product
• https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.mdExploit, Third Party Advisory

Published

Aug 14, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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