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CVE-2025-34491

Gfi Mailessentials remote code execution

8.8 HIGHPublic exploitEPSS 0.95%
  1. Published28 Apr 2025

Description

GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. A remote and authenticated attacker can execute arbitrary code by sending crafted serialized .NET when joining to a Multi-Server setup.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Gfi Mailessentials< 21.8

Remediation

Fixed in
Gfi Mailessentials≥ 21.8

References

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Frequently asked

Is CVE-2025-34491 being actively exploited?

CVE-2025-34491 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.95%.

How severe is CVE-2025-34491?

CVE-2025-34491 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.95% probability of exploitation.

Which products are affected by CVE-2025-34491?

Affected products include Gfi Mailessentials.

How do I fix CVE-2025-34491?

Upgrade affected software to a fixed version, for example Gfi Mailessentials 21.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-34491 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.