CVE-2025-34491
HIGHGFI MailEssentials < 21.8 - Authenticated Remote Code Execution via .NET Deserialization
Title source: llmDescription
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.
References (3)
Core 3
Core References
Exploit technical-description
exploit
https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html
Release Notes vendor-advisory
https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/gfi-mailessentials-multinode-insecure-deserialization
Scores
CVSS v3
8.8
EPSS
0.0071
EPSS Percentile
48.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-502
Status
published
Products (1)
gfi/mailessentials
< 21.8
Published
Apr 28, 2025
Tracked Since
Feb 18, 2026