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GL.iNet GL-MT3000 EUVDEUVD-2026-52520

| CVE-2026-18684 HIGH
Command Injection (CWE-77)
2026-08-03 VulDB GHSA-j682-xx2h-hv5m
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 with no authentication per CVSS 4.0 PR:N; no scope change as only the router OS is impacted.

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 - 23:31 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 03, 2026 - 23:22 vuln.today
cvss_changed
Severity Changed
Aug 03, 2026 - 23:22 NVD
CRITICAL HIGH
CVSS changed
Aug 03, 2026 - 23:22 NVD
9.3 (CRITICAL) 8.9 (HIGH)
Analysis Generated
Aug 03, 2026 - 23:15 vuln.today
CVE Published
Aug 03, 2026 - 22:45 cve.org
CRITICAL 9.3

DescriptionCVE.org

A weakness has been identified in GL.iNet GL-MT3000 up to 4.4.5. This issue affects the function remove_profile of the file /cgi-bin/glc of the component modem.so. This manipulation causes command injection. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. 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 exposes the device to full remote compromise through its modem management CGI endpoint. The vulnerable remove_profile function within modem.so accepts unsanitized input via /cgi-bin/glc, enabling arbitrary OS command execution without authentication. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach router management interface over LAN or WAN
Delivery
Send crafted HTTP request to /cgi-bin/glc
Exploit
Supply shell-injected remove_profile parameter
Execution
modem.so passes unsanitized input to shell
Impact
Execute arbitrary OS commands as root
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Vulnerability AssessmentAI

Exploitation The /cgi-bin/glc endpoint handling the remove_profile function must be reachable by the attacker over the network. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.9 (High) is grounded in a maximally permissive base vector - AV:N/AC:L/AT:N/PR:N/UI:N with full VC:H/VI:H/VA:H - indicating unauthenticated, zero-complexity, remote exploitation with complete impact on the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker on the same LAN segment - or on the WAN if remote management is enabled - sends a crafted HTTP request to /cgi-bin/glc invoking remove_profile with a parameter containing shell metacharacters such as semicolons or backticks. The modem.so library passes the unsanitized value directly to a shell interpreter, executing the attacker-supplied command with the process's privileges, typically root on embedded Linux. …
Remediation No vendor-released patched firmware version has been confirmed in the available data at time of analysis. … 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 and verify firmware versions; immediately isolate any devices running firmware 4.4.5 or earlier from production networks. …

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EUVD-2026-52520 vulnerability details – vuln.today
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