TI-2025-24524 Aliases CVE-2025-34491 GHSA-fqqj-qgxm-vg3x

GFI MailEssentials < 21.8 MultiNode Insecure Deserialization

HIGH 73CWE-502Published 2025-04-28 · Updated 2025-11-19

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00963 61st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix Fixed MailEssentials (GFI): 21.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
GFI Software	MailEssentials	before 21.8	21.8	Patch available	CNA

MailEssentials VendorGFI Software Affected before 21.8 Fixed in 21.8 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:gfi:mailessentials::::::::	before 21.8	Vulnerable	GFI Software

cpe:2.3:a:gfi:mailessentials:*:*:*:*:*:*:*:* Versions before 21.8 Vulnerable ·GFI Software

Remediation

Fix · CNA MailEssentials (GFI) Fixed in 21.8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2025-04-28
GFI MailEssentials — gfi.ai/products-and-solutions/network-security-solutions/ma…
3 records Highest priority Priority HIGH 2 HIGH, 1 LOW
Other records, highest priority first
- TI-2025-24522 GFI MailEssentials < 21.8 Local Privilege EscalationPriority HIGH 69
- TI-2025-24523 GFI MailEssentials < 21.8 XXE Arbitrary File ReadPriority LOW 30
Show all 3 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-34491
2026-10-03 Alias added: GHSA-fqqj-qgxm-vg3x

References

Exploit 1

https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html

Advisory 1

https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases

TI-2025-24522 GFI MailEssentials < 21.8 Local Privilege Escalation CVSS 3.1HIGH 7.8
TI-2004-01190 A bug in the HTML parser in a certain Microsoft HTML library, as used in various third… CVSS 2.0HIGH 10.0
TI-2025-24523 GFI MailEssentials < 21.8 XXE Arbitrary File Read CVSS 3.1MEDIUM 6.5
TI-2026-19022 GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration CVSS 4.0MEDIUM 5.3
TI-2026-19021 GFI MailEssentials AI < 22.4 ListServer.IsDBExist() Absolute Directory Traversal to File Enumeration CVSS 4.0MEDIUM 5.3
TI-2026-19020 GFI MailEssentials AI < 22.4 General Settings Local Domains Domain Description Stored XSS CVSS 4.0MEDIUM 5.1

See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences