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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.

POC

Reference

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

Github

No PoCs found on GitHub currently.