High severity8.8NVD Advisory· Published Apr 28, 2025· Updated Jun 17, 2026

CVE-2025-34491

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Gfi/Mailessentials3 versions
cpe:2.3:a:gfi:mailessentials:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:gfi:mailessentials:*:*:*:*:*:*:*:*range: <21.8
- (no CPE)range: <21.8
- (no CPE)range: 0

Patches

Vulnerability mechanics

References

frycos.github.io/vulns4free/2025/04/28/mailessentials.htmlnvdExploit
gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releasesnvdRelease Notes
www.vulncheck.com/advisories/gfi-mailessentials-multinode-insecure-deserializationnvd

News mentions

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