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

Quick assessment

Affected
GFI MailEssentials
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GFI MailEssentials是GFI公司的一款电子邮件安全套装，包含 14 个反垃圾邮件过滤器、3 个防病毒引擎以及恶意软件扫描功能。 GFI MailEssentials 21.8之前版本存在安全漏洞，该漏洞源于.NET反序列化处理不当，可能导致执行任意代码。

CVSS 8.8 · High EPSS 0.95% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-34491

Vulnerability Information
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Vulnerability Title
GFI MailEssentials < 21.8 MultiNode Insecure Deserialization
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
GFI MailEssentials 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GFI MailEssentials是GFI公司的一款电子邮件安全套装，包含 14 个反垃圾邮件过滤器、3 个防病毒引擎以及恶意软件扫描功能。 GFI MailEssentials 21.8之前版本存在安全漏洞，该漏洞源于.NET反序列化处理不当，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GFI MailEssentials 0 ~ 21.8 -

II. Public POCs for CVE-2025-34491

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III. Intelligence Information for CVE-2025-34491

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Security Blog Posts for CVE-2025-34491 (1)

Vendor Pages for CVE-2025-34491 (1)

Same Patch Batch · GFI · 2025-04-28 · 3 CVEs total

CVE-2025-34489 7.8 HIGH GFI MailEssentials < 21.8 Local Privilege Escalation
CVE-2025-34490 6.5 MEDIUM GFI MailEssentials < 21.8 XXE Arbitrary File Read

IV. Related Vulnerabilities

Same product: MailEssentials
Same vendor: GFI
Same weakness: CWE-502

V. Comments for CVE-2025-34491

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