CVE-2025-12258: Totolink a3300r Firmware

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability was detected in TOTOLINK A3300R 17.0.0cu.557_B20221024. Impacted is the function setOpModeCfg of the file /cgi-bin/cstecgi.cg of the component POST Parameter Handler. The manipulation of the argument opmode results in stack-based buffer overflow. The attack may be performed from remote.

Affected products

• Totolink a3300r Firmware: version 17.0.0cu.557_b20221024 only

Published 2025-10-27. Last modified 2026-10-08.