Vulnerability · Published Aug 14, 2025 · Assigned by VulDB
CVE-2025-8939Tenda AC20 WifiGuestSet buffer overflow
High 8.8
In plain English
A high-severity buffer overflow in AC20 from Tenda. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)1.0%top 36.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-120, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
References
- VDB-319902 | Tenda AC20 WifiGuestSet buffer overflow vdb-entry, technical-description
- VDB-319902 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #631829 | Tenda AC20 ≤ V16.03.08.12 (latest version) Buffer Overflow third-party-advisory
- https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md related
- https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md#3-poc exploit
- https://www.tenda.com.cn/ product