CVE-2025-34071
GFI Kerio Control Unsigned System Image Upload Root Code Execution
CRITICAL 9.4EPSS 0.8%
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.
- Affected
- GFI Software · Kerio Control
- CVSS v4.0 VULNCHECK
- 9.4 CRITICAL
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/E:X/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 - CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.81% chance of exploitation in the next 30 days, 56th percentile
- Published
- 2025-07-02
- Updated
- 2026-02-26
Proof-of-concept exploits (2)
- https://ssd-disclosure.com/ssd-advisory-kerio-control-authentication-bypass-and-rce/
- cppghoul/CVE-2025-340710★ · 2026-10-10
Security advisories
- https://ssd-disclosure.com/ssd-advisory-kerio-control-authentication-bypass-and-rce
- https://vulncheck.com/advisories/gfi-kerio-control-auth-bypass-rce