CVE-2026-18685: Command Injection in GL.iNet GL-MT3000
A critical command injection vulnerability exists in the GL.iNet GL-MT3000 router models up to version 4.4.5. The flaw is located in the set_upgrade function within the /cgi-bin/glc script of the modem.so component. This vulnerability allows remote attackers to execute arbitrary commands without any authentication or user interaction. The vulnerability has been publicly disclosed and confirmed by the vendor, but no official patch or remediation guidance has been provided yet.
AI Analysis
Technical Summary
CVE-2026-18685 is a critical remote command injection vulnerability affecting GL.iNet GL-MT3000 devices running firmware versions 4.4.0 through 4.4.5. The issue resides in the set_upgrade function of the /cgi-bin/glc script in the modem.so component, enabling unauthenticated remote attackers to execute arbitrary system commands. The vulnerability has been publicly disclosed and confirmed by the vendor. The CVSS 4.0 base score is 9.3, reflecting high exploitability and impact. No official fix or patch has been documented at this time.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary commands on affected devices without authentication or user interaction, potentially leading to full system compromise. This can result in unauthorized control over the device, data theft, or disruption of network services.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict remote access to the device's management interfaces and monitor for suspicious activity. Follow vendor communications closely for updates on patches or mitigations.
CVE-2026-18685: Command Injection in GL.iNet GL-MT3000
Description
A critical command injection vulnerability exists in the GL.iNet GL-MT3000 router models up to version 4.4.5. The flaw is located in the set_upgrade function within the /cgi-bin/glc script of the modem.so component. This vulnerability allows remote attackers to execute arbitrary commands without any authentication or user interaction. The vulnerability has been publicly disclosed and confirmed by the vendor, but no official patch or remediation guidance has been provided yet.
CVSS v4.0
Score 9.3critical
Affected software
GL.iNet
GL-MT3000
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-18685 is a critical remote command injection vulnerability affecting GL.iNet GL-MT3000 devices running firmware versions 4.4.0 through 4.4.5. The issue resides in the set_upgrade function of the /cgi-bin/glc script in the modem.so component, enabling unauthenticated remote attackers to execute arbitrary system commands. The vulnerability has been publicly disclosed and confirmed by the vendor. The CVSS 4.0 base score is 9.3, reflecting high exploitability and impact. No official fix or patch has been documented at this time.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary commands on affected devices without authentication or user interaction, potentially leading to full system compromise. This can result in unauthorized control over the device, data theft, or disruption of network services.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict remote access to the device's management interfaces and monitor for suspicious activity. Follow vendor communications closely for updates on patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-03T15:50:05.082Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7121fcbf32cb7a3462c045
Added to database: 08/03/2026, 23:19:24 UTC
Last enriched: 08/11/2026, 18:34:33 UTC
Last updated: 09/17/2026, 22:01:33 UTC
Views: 97
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