CVE-2025-8939

Name: CVE-2025-8939
Creator: NVD / NIST
Published: 2025-08-14T06:15:28.913+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2025-8939 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. A vulnerability was determined in Tenda AC20 up to 16.03.08.12. Affected is an unknown function of the file /goform/WifiGuestSet. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

7.4/10

CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.81%

52.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tenda	Ac20 Firmware	>= 16.03.08.0, <= 16.03.08.12

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

Timeline

Published: Aug 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-8939?

How severe is CVE-2025-8939?

CVE-2025-8939 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2025-8939?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-8939?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST