CVE-2026-5020: Totolink a3600r Firmware

Critical severity, CVSS 9.8. EPSS: 3.7% chance of exploitation in the next 30 days.

A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102. Affected by this issue is the function setNoticeCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument NoticeUrl results in command injection. The attack may be launched remotely. The exploit is now public and may be used.

Affected products

• Totolink a3600r Firmware: version 4.1.2cu.5182_b20201102 only

Published 2026-03-29. Last modified 2026-06-17.