---
id: CVE-2025-34071
title: GFI Kerio Control Unsigned System Image Upload Root Code Execution
summary: >-
  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 fi…
severity: critical
cvss: 9.4
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-306
vendor: GFI Software
product: Kerio Control
affected:
  - kerio_control 9.4.5
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-07-03T03:55:34.302738Z'
exploitAvailable: true
published: '2025-07-02'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T22:02:59.563Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-34071'
references:
  - url: >-
      https://ssd-disclosure.com/ssd-advisory-kerio-control-authentication-bypass-and-rce/
  - url: 'https://vulncheck.com/advisories/gfi-kerio-control-auth-bypass-rce'
tags:
  - cve.org
  - exploit-available
epss: 0.00813
epssPercentile: 0.57219
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/cppghoul/CVE-2025-34071'
  checkedAt: '2026-11-07T17:49:27.181Z'
ingestedAt: '2026-11-05T20:33:06.552Z'
---

## Overview

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

- `kerio_control 9.4.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.