CVE-2026-5030: Totolink NR1800X Firmware

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

A vulnerability has been found in Totolink NR1800X 9.1.0u.6279_B20210910. This issue affects the function NTPSyncWithHost of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. The manipulation of the argument host_time leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Affected products

• Totolink NR1800X Firmware: version 9.1.0u.6279_b20210910 only

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