CVE-2025-34491

GFI MailEssentials MultiNode Insecure Deserialization

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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.

*Credits: Frycos

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

Poc

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2025-04-15 CVE Reserved
2025-04-28 CVE Published
2025-04-28 CVE Updated
2025-04-28 First Exploit
2025-05-04 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-502: Deserialization of Untrusted Data

CAPEC

CAPEC-586: Object Injection

References (2)

URL	Tag	Source

URL	Date	SRC
https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html	2025-04-28

URL	Date	SRC

URL	Date	SRC
https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases	2025-04-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
GFI Search vendor "GFI"		MailEssentials Search vendor "GFI" for product "MailEssentials"				< 21.8 Search vendor "GFI" for product "MailEssentials" and version " < 21.8"		en		Affected