CVE-2025-8939
A vulnerability was determined in Tenda AC20 up to 16.03.08.12.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.4 HIGHCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.94% probability · 61th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119, CWE-120
- Affected
- tenda/ac20 firmware
- Source
- cna@vuldb.com
EPSS 0.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.