CVE-2025-63835: tenda ac18_firmware Out-of-bounds Write

Vulnerability summary

CVE-2025-63835 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in tenda ac18_firmware. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 10-11-2025
   PublishedVulnerability first disclosed.
2. 18-11-2025
   Last modifiedVulnerability information updated.

Description

A stack-based buffer overflow vulnerability was discovered in Tenda AC18 v15.03.05.05_multi. The vulnerability exists in the guestSsid parameter of the /goform/WifiGuestSet interface. Remote attackers can exploit this vulnerability by sending oversized data to the guestSsid parameter, leading to denial of service (device crash) or potential remote code execution.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).