CVE-2025-34491

Public Exploit
GFI MailEssentials MultiNode Insecure Deserialization

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.

Category

8.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.09%
Vendor Advisory gfi.ai
Affected: GFI MailEssentials
Published at:
Updated at:

References

Link Tags
https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html exploit technical description
https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases release notes vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-34491?
CVE-2025-34491 has been scored as a high severity vulnerability.
How to fix CVE-2025-34491?
To fix CVE-2025-34491, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-34491 being actively exploited in the wild?
It is possible that CVE-2025-34491 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-34491?
CVE-2025-34491 affects GFI MailEssentials.
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