Vulnerability · Published Aug 3, 2026 · Assigned by VulDB

CVE-2026-18685GL.iNet GL-MT3000 modem.so glc set_upgrade command injection

Critical 9.8

In plain English

A critical-severity command injection in GL-MT3000 from GL.iNet. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 3.6% (higher than 90% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)3.6%top 10.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. Impacted is the function set_upgrade of the file /cgi-bin/glc of the component modem.so. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

Affected products (as reported)

Vendor	Product	Versions
GL.iNet	GL-MT3000	4.4.04.4.14.4.24.4.34.4.44.4.5

Weakness: CWE-77, CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-385611 | GL.iNet GL-MT3000 modem.so glc set_upgrade command injection vdb-entry, technical-description
VDB-385611 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-18685 | CVE Analysis and Report third-party-advisory
Submit #851593 | GL.iNet MT3000 4.4.5 Command Injection third-party-advisory
https://github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/modem_set_upgrade_glc_rce exploit, patch