CVE-2026-5030 Totolink NR1800X Telnet Service cstecgi.cgi NTPSyncWithHost command injection

Medium 5.3 Published 29 Mar 2026 Updated 30 Mar 2026

Remote attackers can execute arbitrary commands on Totolink NR1800X routers via the Telnet service NTPSyncWithHost function.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-5030?

CVE-2026-5030 is a medium-severity command injection vulnerability in Totolink NR1800X, published on 29 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-5030?

It affects 1 product.

Products include Totolink Nr1800x Firmware.

How do I fix CVE-2026-5030?

No fix has been published for CVE-2026-5030 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-5030 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5030 exists.

Sources

Also known as GHSA-8fgh-55xj-7pjm.