CVE-2025-34071

GFI Kerio Control Unsigned System Image Upload Root Code Execution

CVSS 9.4 CRITICALEPSS 0.7%CWE-306

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.4EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

02 Jul 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

A remote code execution vulnerability in GFI Kerio Control 9.4.5 allows attackers with administrative access to upload and execute arbitrary code through the firmware upgrade feature. The system upgrade mechanism accepts unsigned .img files, which can be modified to include malicious scripts within the upgrade.sh or disk image components. These modified upgrade images are not validated for authenticity or integrity, and are executed by the system post-upload, enabling root access.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Affected products

GFI Software · Kerio Control

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References

https://ssd-disclosure.com/ssd-advisory-kerio-control-authentication-bypass-and-rce/https://vulncheck.com/advisories/gfi-kerio-control-auth-bypass-rce