CVE-2025-34491 HIGH

CVE-2025-34491: GFI MailEssentials < 21.8 MultiNode Insecure Deserialization

Vendor Gfi
Product MailEssentials
Weakness CWE-502 · Unsafe deserialization
Published April 28, 2025
Last update November 19, 2025
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 28, 2025 CVE published
November 19, 2025 Record updated