CVE-2025-4849: Totolink n300rh Firmware

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

A vulnerability was found in TOTOLINK N300RH 6.1c.1390_B20191101. It has been rated as critical. Affected by this issue is the function CloudACMunualUpdateUserdata of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument url leads to command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Affected products

• Totolink n300rh Firmware: version 6.1c.1390_b20191101 only

Published 2025-05-18. Last modified 2026-06-17.