CVE-2025-34071Public exploitNetwork attack vector

Root code execution via unsigned upgrade image

Published Jul 2, 2025 · Updated Feb 26, 2026

Code execution in GFI Software Kerio Control 9.4.5 allows remote authenticated users to gain root access via a modified upgrade image. The firmware upgrade handler accepts a gzip-compressed TAR image without authenticity or integrity validation, then runs its replaceable upgrade.sh content. Administrative access is required for the upload; successful execution grants persistent root-level control of the appliance.

CVSS severity9.4
Critical
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code execution in GFI Software Kerio Control 9.4.5 allows remote authenticated users to gain root access via a modified upgrade image. The firmware upgrade handler accepts a gzip-compressed TAR image without authenticity or integrity validation, then runs its replaceable upgrade.sh content. Administrative access is required for the upload; successful execution grants persistent root-level control of the appliance.

The record

CVE
CVE-2025-34071
Published
Jul 2, 2025
Updated
Feb 26, 2026
Vendor
GFI Software
Product
Kerio Control
Classifications
CWE-306, CAPEC-137, CAPEC-115, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

GFI Software · Kerio Controlversion=9.4.5

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.4VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CAPEC-137Parameter Injection
CAPEC-115Authentication Bypass
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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