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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.008 (53.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001
Affected products
- Gfi Kerio Control — versions 9.4.5
- Gfi Software Kerio Control — versions 9.4.5
Weakness classification (CWE)
References
- ssd-disclosure.com/ssd-advisory-kerio-control-authentication-bypass-and-rce/ (Exploit, technical-description, Third Party Advisory, exploit, third-party-advisory)
- vulncheck.com/advisories/gfi-kerio-control-auth-bypass-rce (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.