CVE-2025-34489
HIGHGFI MailEssentials < 21.8 - Local Privilege Escalation via .NET Remoting Service Deserialization
Title source: llmDescription
GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue. A local attacker can escalate to NT Authority/SYSTEM by sending a crafted serialized payload to a .NET Remoting Service.
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-local-privilege-escalation
Scores
CVSS v3
7.8
EPSS
0.0026
EPSS Percentile
16.9%
Attack Vector
LOCAL
CVSS:3.1/AV:L/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