CVE-2025-34071
Published: 02 July 2025
Summary
CVE-2025-34071 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Gfi Kerio Control. Its CVSS base score is 9.4 (Critical).
Operationally, ranked in the top 12.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
A remote code execution vulnerability affects GFI Kerio Control version 9.4.5. The flaw resides in the firmware upgrade mechanism, which accepts unsigned .img files without validating their authenticity or integrity. Attackers can embed malicious scripts in the upgrade.sh file or disk image components, and the system executes these files after upload, granting root-level access. The issue is tracked under CWE-306 and carries a CVSS 4.0 score of 9.4.
An attacker with administrative access can exploit the weakness over the network by crafting and uploading a modified firmware image. Successful exploitation results in arbitrary code execution with full root privileges on the affected appliance, enabling complete system compromise.
Public advisories from SSD Disclosure and VulnCheck document the authentication bypass and remote code execution details but do not describe available patches or mitigation steps in the provided references. The EPSS score remains flat at 0.0312 with no observed increase after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-19720
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Requires established identification and authentication to unlock, mitigating missing authentication for continued system access.
Requiring identification and rationale for actions allowed without authentication ensures critical functions are not left unprotected by forcing review of authentication requirements.
Authorizing mobile device connections to organizational systems ensures authentication is performed for this critical access function.
Guarantees critical functions are protected by mandatory invocation of the access control mechanism.
Auditing sessions makes it possible to detect access to critical functions without required authentication.
The assessment process confirms authentication is present and effective for critical functions, preventing exploitation from missing authentication.
Certification assesses that critical functions have required authentication controls in place.
Disabling non-essential functions and services eliminates the need to secure them, reducing exposure from missing authentication on unnecessary components.