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Vulnerability record · CVE-2025-34489 · published 28 April 2025

CVE-2025-34489: Gfi mailessentials deserialization of untrusted data vulnerability

Gfi · Mailessentials

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.

7.8 CVSS 3.1 High EPSS 0.33% · top 76.7% CWE-502 · Deserialization of untrusted data
7.8CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html Exploit
https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases Release Notes
https://www.vulncheck.com/advisories/gfi-mailessentials-local-privilege-escalation

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-1312Gfi mailessentials vulnerabilityA bug in the HTML parser in a certain Microsoft HTML library, as used in various third party products, may allow remote attackers to cause a denial o…EPSS 2.5%8.8CVE-2025-34491Gfi mailessentials deserialization of untrusted data vulnerabilityGFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. A remote and authenticated attacker can execute arbitrary cod…EPSS 0.95%6.5CVE-2025-34490Gfi mailessentials xml external entity (xxe) vulnerabilityGFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issue. An authenticated and remote attacker can send crafted H…EPSS 0.72%5.3CVE-2026-23621Gfi mailessentials observable discrepancy vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web m…EPSS 0.25%5.3CVE-2026-23620Gfi mailessentials observable discrepancy vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain an arbitrary file existence enumeration vulnerability in the ListServer.IsDBExist() web method e…EPSS 0.19%5.1CVE-2026-23616Gfi mailessentials cross-site scripting vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Anti-Spoofing configuration page. An authenti…EPSS 0.18%5.1CVE-2026-23617Gfi mailessentials cross-site scripting vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword Checking (Body) conditions inter…EPSS 0.18%5.1CVE-2026-23618Gfi mailessentials cross-site scripting vulnerabilityGFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword Checking (Subject) conditions in…EPSS 0.18%

Source: NIST National Vulnerability Database (record CVE-2025-34489), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.