CVE-2025-34491

HIGH
2025-04-28 [email protected]
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 18:39 vuln.today
PoC Detected
Nov 04, 2025 - 23:15 vuln.today
Public exploit code
CVE Published
Apr 28, 2025 - 20:15 nvd
HIGH 8.8

Tags

RCE Deserialization Mailessentials

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.

Analysis

GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Technical Context

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. 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. Affected products include: Gfi Mailessentials. Version information: version 21.8.

Affected Products

Gfi Mailessentials.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

Priority Score

65
Low Medium High Critical
KEV: 0
EPSS: +1.2
CVSS: +44
POC: +20

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CVE-2025-34491 vulnerability details – vuln.today
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