CVE-2025-9303: Totolink a720r Firmware

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

A security flaw has been discovered in TOTOLINK A720R 4.1.5cu.630_B20250509. This issue affects the function setParentalRules of the file /cgi-bin/cstecgi.cgi. Performing manipulation of the argument desc results in buffer overflow. The attack is possible to be carried out remotely. The exploit has been released to the public and may be exploited.

Affected products

• Totolink a720r Firmware: version 4.1.5cu.630_b20250509 only

Published 2025-08-21. Last modified 2026-06-17.