Vulnerability · Published Jul 2, 2025 · Assigned by VulnCheck
CVE-2025-34071GFI Kerio Control Unsigned System Image Upload Root Code Execution
Critical 9.4
In plain English
A critical-severity missing authentication in Kerio Control from GFI Software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GFI Software | Kerio Control | 9.4.5 |
Weakness: CWE-306 · Vector: 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
References
- https://ssd-disclosure.com/ssd-advisory-kerio-control-authentication-bypass-and-rce/ third-party-advisory, technical-description, exploit
- https://vulncheck.com/advisories/gfi-kerio-control-auth-bypass-rce third-party-advisory