CVE-2025-34491

GFI MailEssentials < 21.8 MultiNode Insecure Deserialization

Published Apr 28, 2025 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-14683 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.
History
Type Values Removed Values Added
Title GFI MailEssentials MultiNode Insecure Deserialization GFI MailEssentials < 21.8 MultiNode Insecure Deserialization
Type Values Removed Values Added
First Time appeared Gfi
Gfi mailessentials
CPEs cpe:2.3:a:gfi:mailessentials:*:*:*:*:*:*:*:*
Vendors & Products Gfi
Gfi mailessentials
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title GFI MailEssentials MultiNode Insecure Deserialization
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 19, 2025, 1:25 AM
Reserved
Apr 15, 2025, 7:15 PM
Status
Modified
Published
Apr 28, 2025, 8:15 PM
Modified
Jun 17, 2026, 9:14 AM