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GL.iNet GL-MT3000 CVE-2026-18602

| EUVDEUVD-2026-52335 HIGH
Command Injection (CWE-77)
2026-08-03 VulDB GHSA-767p-4fhm-3wpv
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-accessible CGI endpoint requires no authentication or user interaction; full C/I/A impact confined to the vulnerable router with no scope change.

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

6
Analysis Updated
Aug 03, 2026 - 17:50 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 03, 2026 - 17:37 vuln.today
cvss_changed
Severity Changed
Aug 03, 2026 - 17:37 NVD
CRITICAL HIGH
CVSS changed
Aug 03, 2026 - 17:37 NVD
9.3 (CRITICAL) 8.9 (HIGH)
Analysis Generated
Aug 03, 2026 - 17:12 vuln.today
CVE Published
Aug 03, 2026 - 15:30 cve.org
CRITICAL 9.3

DescriptionCVE.org

A vulnerability was determined in GL.iNet GL-MT3000 up to 4.4.5. Affected is the function ovpn-client.get_recommend_config of the file /cgi-bin/glc of the component ovpn-client.so Native Plugin. Executing a manipulation of the argument Hostname can lead to command injection. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

AnalysisAI

Remote command injection in GL.iNet GL-MT3000 routers (firmware 4.4.0-4.4.5) allows unauthenticated network attackers to execute arbitrary OS commands by supplying crafted shell metacharacters in the Hostname argument to the ovpn-client.get_recommend_config function exposed via the /cgi-bin/glc CGI endpoint. The vendor has confirmed the vulnerability's existence, and a public proof-of-concept exploit is hosted on GitHub, materially lowering the exploitation barrier. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet-exposed GL-MT3000 management interface
Delivery
Send crafted HTTP request to /cgi-bin/glc
Exploit
Inject shell commands via Hostname parameter
Execution
ovpn-client.so passes unsanitized input to OS shell
Persist
Arbitrary commands execute as CGI process
Impact
Full router compromise achieved
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Vulnerability AssessmentAI

Exploitation The target must be a GL.iNet GL-MT3000 running firmware 4.4.0 through 4.4.5 with the /cgi-bin/glc endpoint and ovpn-client.so plugin active - this is a default configuration for these firmware versions. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.9 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) accurately reflects the severity: no authentication, no user interaction, low complexity, and full impact on the device's confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated remote attacker sends a crafted HTTP request to the /cgi-bin/glc endpoint of an internet-exposed GL-MT3000 router, embedding shell metacharacters (e.g., a semicolon followed by an arbitrary command) in the Hostname parameter of the ovpn-client.get_recommend_config function. The unsanitized input is passed to the underlying OpenWrt shell, executing the injected command with the privileges of the CGI process. …
Remediation No vendor-released patch has been identified in any of the provided references at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all GL-MT3000 routers with firmware 4.4.0-4.4.5 in your deployed fleet and isolate internet-exposed instances immediately by restricting network access via firewall rules or physical segregation. …

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CVE-2026-18602 vulnerability details – vuln.today
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