Command Injection Vulnerability in GL.iNet GL-MT3000 Router Software
CVE-2026-18685

9.3CRITICAL

Key Information:

Vendor

Gl.inet

Status
Gl-mt3000
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18685?

A command injection vulnerability has been identified in the GL.iNet GL-MT3000 router’s firmware versions up to 4.4.5. The issue resides in the 'set_upgrade' function located in the 'modem.so' component of the '/cgi-bin/glc' file. This flaw enables an attacker to execute arbitrary commands remotely, potentially compromising the device's integrity and security. The flaw has been publicly disclosed, and both attackers and cybersecurity professionals are now aware of this exploit, making prompt remediation critical. GL.iNet has been notified about this vulnerability and has acknowledged its existence.

Affected Version(s)

GL-MT3000 4.4.0

GL-MT3000 4.4.1

GL-MT3000 4.4.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-18685 - Proof of Concept

References

https://vuldb.com/vuln/385611
vdb-entrytechnical-description
https://vuldb.com/vuln/385611/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18685
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Strforexc2 (VulDB User)
VulDB CNA Team
.