CVE-2025-34491

HIGH 8.8EPSS 0.9%

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.

CVSS v3.1: 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v3.1: 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.88% chance of exploitation in the next 30 days, 57th percentile
Published: 2025-04-28
Updated: 2025-11-19

Proof-of-concept exploits (1)

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

References

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