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GL.iNet GL-MT3000 CVE-2026-18601

| EUVDEUVD-2026-52271 HIGH
Command Injection (CWE-77)
2026-08-03 VulDB GHSA-qv2j-hh7r-m4m2
Command Injection Gl Mt3000
8.9
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
8.9 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.8 CRITICAL

Network-reachable CGI endpoint with no confirmed authentication requirement per VulDB CVSS 4.0; complete impact on device with no scope change to external systems.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Analysis Generated
Aug 03, 2026 - 14:32 vuln.today
Severity Changed
Aug 03, 2026 - 14:22 NVD
CRITICAL HIGH
CVSS changed
Aug 03, 2026 - 14:22 NVD
9.3 (CRITICAL) 8.9 (HIGH)
CVE Published
Aug 03, 2026 - 13:15 cve.org
HIGH 8.9

DescriptionCVE.org

A vulnerability was found in GL.iNet GL-MT3000 up to 4.4.5. This impacts the function ovpn-client.check_config of the file /cgi-bin/glc of the component ovpn-client.so Native Plugin. Performing a manipulation of the argument filename results in command injection. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

AnalysisAI

Remote command injection in GL.iNet GL-MT3000 router firmware (versions 4.4.0 through 4.4.5) allows unauthenticated network-reachable attackers to execute arbitrary OS commands by supplying a crafted filename argument to the ovpn-client.check_config function exposed via the /cgi-bin/glc CGI endpoint. The vendor confirmed the vulnerability's existence, and a public proof-of-concept exploit is published on GitHub (StrTzz123/iot_vul), materially lowering the bar for exploitation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify GL-MT3000 on network
Delivery
Send crafted HTTP request to /cgi-bin/glc
Exploit
Inject shell metacharacters via filename parameter
Execution
ovpn-client.so passes input unsanitized to system call
Persist
Arbitrary OS command executes as firmware process
Impact
Full router compromise
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Vulnerability AssessmentAI

Exploitation The /cgi-bin/glc CGI endpoint must be reachable by the attacker, which is satisfied by default for any device on the same LAN as the router - no special network configuration is required for LAN-side exploitation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base vector (AV:N/AC:L/AT:N/PR:N/UI:N) represents the most severe exploitation profile possible: the vulnerable endpoint is reachable over the network, requires no complexity or preconditions, no privileges, and no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker on the same LAN as the GL-MT3000 - or on the WAN if remote admin is enabled - sends a crafted HTTP request to /cgi-bin/glc with a filename parameter containing shell metacharacters such as semicolons or command substitution syntax. The ovpn-client.so native plugin passes this value directly to a system-level call without sanitization, executing the injected command with the router firmware process's privileges. …
Remediation No vendor-released patched firmware version is confirmed in the available data; affected users should immediately monitor GL.iNet's official firmware release page and the VulDB entry at https://vuldb.com/vuln/385516 for an update beyond 4.4.5. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct an immediate inventory of all GL.iNet GL-MT3000 routers running firmware versions 4.4.0-4.4.5 in production and implement emergency network isolation or deactivation of non-critical instances to prevent exploitation. …

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CVE-2026-18601 vulnerability details – vuln.today
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