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GL.iNet GL-MT3000 CVE-2026-18685

| EUVDEUVD-2026-52537 HIGH
Command Injection (CWE-77)
2026-08-03 VulDB GHSA-frjc-j2mw-rv29
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 authentication per CVSS 4.0 PR:N; full system compromise on embedded device with no scope change to subsequent 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

6
Analysis Updated
Aug 04, 2026 - 00:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 04, 2026 - 00:22 vuln.today
cvss_changed
Severity Changed
Aug 04, 2026 - 00:22 NVD
CRITICAL HIGH
CVSS changed
Aug 04, 2026 - 00:22 NVD
9.3 (CRITICAL) 8.9 (HIGH)
Analysis Generated
Aug 04, 2026 - 00:10 vuln.today
CVE Published
Aug 03, 2026 - 23:15 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

AnalysisAI

Command injection in GL.iNet GL-MT3000 firmware up to version 4.4.5 allows remote attackers to execute arbitrary OS commands through the set_upgrade function exposed via the /cgi-bin/glc CGI endpoint in modem.so. The CVSS 4.0 base score of 8.9 (with E:P reflecting public exploit availability) reflects high confidentiality, integrity, and availability impact on the affected device. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify GL-MT3000 management interface on network
Delivery
Send crafted HTTP request to /cgi-bin/glc
Exploit
Inject shell metacharacters into set_upgrade parameter
Execution
modem.so passes input unsanitized to system command
Impact
Execute arbitrary OS commands as root on device
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Vulnerability AssessmentAI

Exploitation Per the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N), exploitation requires only network reachability to the GL-MT3000 web management interface (typically TCP 80 or 443) with no authentication, no special configuration beyond default firmware state, and no user interaction. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) characterizes this as remotely exploitable with low complexity, no privileges required, and no user interaction - a worst-case accessibility profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker with network access to the GL-MT3000 management interface sends a crafted HTTP request to `/cgi-bin/glc` targeting the `set_upgrade` function, embedding shell metacharacters (e.g., semicolons, backticks, or `$()` constructs) in a parameter that `modem.so` passes unsanitized to a system call. On embedded OpenWrt-based devices, CGI processes typically run as root, so the injected command executes with full device privileges - enabling persistent backdoor installation, credential exfiltration, or use of the device as a network pivot. …
Remediation No vendor-released patched firmware version number is confirmed in the available reference data - patch availability must be verified directly with GL.iNet's official firmware release channel and the VulDB entry at https://vuldb.com/vuln/385611. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all GL-MT3000 devices in your environment, identify those running firmware 4.4.5 or earlier, and immediately remove external network access or restrict management interface connectivity to secure administrative networks only. …

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CVE-2026-18685 vulnerability details – vuln.today
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