CVE-2025-67445: Totolink x5000r Firmware

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

TOTOLINK X5000R V9.1.0cu.2415_B20250515 contains a denial-of-service vulnerability in /cgi-bin/cstecgi.cgi. The CGI reads the CONTENT_LENGTH environment variable and allocates memory using malloc (CONTENT_LENGTH + 1) without sufficient bounds checking. When lighttpd s request size limit is not enforced, a crafted large POST request can cause memory exhaustion or a segmentation fault, leading to a crash of the management CGI and loss of availability of the web interface.

Affected products

• Totolink x5000r Firmware: version 9.1.0cu.2415_b20250515 only

Published 2026-02-24. Last modified 2026-07-05.