CVE-2025-8940: tenda ac20_firmware

Vulnerability summary

CVE-2025-8940 is a high (CVSS 9.0) vulnerability in tenda ac20_firmware. EPSS estimates a 0.91% chance of exploitation in the next 30 days, higher than 59.5% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 14-08-2025
   PublishedVulnerability first disclosed.
2. 15-08-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability was identified in Tenda AC20 up to 16.03.08.12. Affected by this vulnerability is the function strcpy of the file /goform/saveParentControlInfo. The manipulation of the argument Time leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.