CVE-2025-34071: A remote code execution vulnerability in GFI Kerio Control 9.4.5 allows attackers with administrative access t

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-34071 is a critical-severity flaw (CVSS 9.8) affecting kerio control. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-306
Published	2025-07-02
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: gfi

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-07-02 14:15 UTCPublished CVE record published
2026-06-17 09:13 UTCUpdated Record last modified

gfi kerio control DOWNGRADE

Affected: 9.4.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.4.5

1. Check installed version

apt-cache policy kerio-control || rpm -q kerio-control || kerio-control --version

2. No fixed release: DOWNGRADE to a release before 9.4.5 (Debian / Ubuntu)

apt-cache madison kerio-control sudo apt install kerio-control=<VERSION_BEFORE_9.4.5> sudo apt-mark hold kerio-control

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list kerio-control sudo dnf downgrade kerio-control-<VERSION_BEFORE_9.4.5> sudo dnf versionlock add kerio-control

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-34071?

kerio control: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-34071 being exploited?

CVE-2025-34071 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-34071 affect?

CVE-2025-34071 affects kerio control. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2025-34071?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-34070 CRITICAL 9.8 DOWNGRADE A missing authentication vulnerability in the GFIAgent component of GFI Kerio Control 9.4.5 allows unauthentic
CVE-2025-34069 CRITICAL 9.8 DOWNGRADE An authentication bypass vulnerability exists in GFI Kerio Control 9.4.5 due to insecure default proxy configu
CVE-2024-52875 HIGH 8.8 UPGRADE An issue was discovered in GFI Kerio Control 9.2.5 through 9.4.5

References

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