CVE-2025-8939

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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.

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

9.0 /10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:S/C:C/I:C/A:C

Exploitability : 8.0 / Impact : 10.0

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References
Link Resource
https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md Exploit Third Party Advisory
https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md#3-poc Exploit Third Party Advisory
https://vuldb.com/?ctiid.319902 Permissions Required VDB Entry
https://vuldb.com/?id.319902 Third Party Advisory VDB Entry
https://vuldb.com/?submit.631829 Third Party Advisory VDB Entry
https://www.tenda.com.cn/ Product
https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md Exploit Third Party Advisory
Configurations

Configuration 1 (hide)

AND
cpe:2.3:o:tenda:ac20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:tenda:ac20:-:*:*:*:*:*:*:*
History

19 Aug 2025, 18:35

Type Values Removed Values Added
CPE cpe:2.3:h:tenda:ac20:-:*:*:*:*:*:*:*
cpe:2.3:o:tenda:ac20_firmware:*:*:*:*:*:*:*:*
First Time Tenda ac20
Tenda
Tenda ac20 Firmware
References () https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md - () https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md - Exploit, Third Party Advisory
References () https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md#3-poc - () https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md#3-poc - Exploit, Third Party Advisory
References () https://vuldb.com/?ctiid.319902 - () https://vuldb.com/?ctiid.319902 - Permissions Required, VDB Entry
References () https://vuldb.com/?id.319902 - () https://vuldb.com/?id.319902 - Third Party Advisory, VDB Entry
References () https://vuldb.com/?submit.631829 - () https://vuldb.com/?submit.631829 - Third Party Advisory, VDB Entry
References () https://www.tenda.com.cn/ - () https://www.tenda.com.cn/ - Product

15 Aug 2025, 13:15

Type Values Removed Values Added
References () https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md - () https://github.com/lin-3-start/lin-cve/blob/main/Tenda%20AC20/Tenda%20AC20.md -

14 Aug 2025, 13:11

Type Values Removed Values Added
Summary
  • (es) Se detectó una vulnerabilidad en Tenda AC20 hasta la versión 16.03.08.12. Se ve afectada una función desconocida del archivo /goform/WifiGuestSet. La manipulación del argumento shareSpeed provoca un desbordamiento del búfer. El ataque puede ejecutarse en remoto. Se ha hecho público el exploit y puede que sea utilizado.

14 Aug 2025, 06:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-08-14 06:15

Updated : 2025-08-19 18:35

NVD link : CVE-2025-8939

Mitre link : CVE-2025-8939

CVE.ORG link : CVE-2025-8939

JSON object : View

Products Affected

tenda

  • ac20_firmware
  • ac20
CWE
CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')