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GL.iNet GL-MT3000 CVE-2026-18599

| EUVDEUVD-2026-52264 HIGH
Command Injection (CWE-77)
2026-08-03 VulDB GHSA-9x8v-f5rv-67fr
Command Injection Gl Mt3000
7.3
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
7.3 HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/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
8.0 HIGH

Adjacent attack vector and low-privilege auth required per CVSS 4.0 source; full C/I/A impact on the vulnerable device with no scope change to subsequent systems.

3.1 AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:A/AC:L/AT:N/PR:L/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:A/AC:L/AT:N/PR:L/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
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Analysis Updated
Aug 03, 2026 - 13:29 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 03, 2026 - 13:22 vuln.today
cvss_changed
CVSS changed
Aug 03, 2026 - 13:22 NVD
8.6 (HIGH) 7.3 (HIGH)
Analysis Generated
Aug 03, 2026 - 13:22 vuln.today
CVE Published
Aug 03, 2026 - 12:00 cve.org
HIGH 8.6

DescriptionCVE.org

A flaw has been found in GL.iNet GL-MT3000 up to 4.4.5. The impacted element is the function logread.set_config of the file /usr/lib/oui-httpd/rpc/logread of the component Logread Lua RPC Plugin. This manipulation of the argument record_size causes command injection. The exploit has been published 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 versions 4.4.0 through 4.4.5 allows an adjacent, low-privileged attacker to execute arbitrary OS commands by manipulating the record_size argument in the logread.set_config RPC function of the Logread Lua plugin. A proof-of-concept exploit has been publicly released on GitHub, and the vendor confirmed the vulnerability exists following early disclosure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain LAN or Wi-Fi adjacency to GL-MT3000
Delivery
Authenticate to router HTTP RPC interface with low-privilege credentials
Exploit
Send crafted RPC call to logread.set_config
Execution
Inject shell metacharacters into record_size argument
Persist
Trigger unsanitized OS command execution
Impact
Achieve arbitrary command execution on router
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Vulnerability AssessmentAI

Exploitation Exploitation requires two concrete prerequisites: (1) the attacker must be on the same network segment as the GL-MT3000 - LAN, Wi-Fi (including as a connected wireless client), or bridged VLAN - per the AV:A (Adjacent) CVSS 4.0 metric; and (2) the attacker must hold valid low-privilege credentials to the router's HTTP RPC interface (PR:L), which in GL.iNet's architecture typically means the web administration account. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 7.3 with threat modifier E:P (proof of concept exists) reflects genuine but bounded risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker connected to the same Wi-Fi or LAN segment as a GL-MT3000 running firmware 4.4.0-4.4.5, possessing low-privilege router credentials (e.g., a guest account or stolen admin password), sends a crafted HTTP RPC request to the `logread.set_config` endpoint with shell metacharacters embedded in the `record_size` parameter. The Lua plugin passes the unsanitized value directly into an OS command, executing the attacker's payload with the privileges of the `oui-httpd` process. …
Remediation No vendor-released patched firmware version was identified in any available intelligence source at time of analysis; operators should monitor GL.iNet's official firmware release channel for an update addressing CVE-2026-18599. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and isolate all GL.iNet GL-MT3000 devices running firmware 4.4.0-4.4.5 to a restricted network segment with no access from untrusted networks; document the current inventory and exposure. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-18599 vulnerability details – vuln.today
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