Auth bypass in Gfi Kerio Control
CVE-2025-34071
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.
Vulnerability class: Broken Authentication
EPSS: 0.007 (49.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Gfi Kerio_control — versions 9.4.5
- Gfi Software Kerio Control — versions 9.4.5
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Exploit, technical-description, Third Party Advisory, exploit, third-party-advisory)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34071?
- CVE-2025-34071 is a critical-severity vulnerability in Gfi Kerio Control, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-07-02.
- How severe is CVE-2025-34071?
- Critical severity. CVSS v3 base score is 9.8 out of 10.