CVE-2025-34491
GFI MailEssentials < 21.8 MultiNode Insecure Deserialization
- State
- Published
- Severity
- 8.8 High
- Published
- Apr 28, 2025
- Updated
- Nov 19, 2025
- Reserved
- Apr 15, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
MailEssentialsGFI |
|
References
- https://frycos.github.io/vulns4free/2025/04/28/mailessentials.htmltechnical-descriptionexploit
- https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releasesvendor-advisory
- https://www.vulncheck.com/advisories/gfi-mailessentials-multinode-insecure-deserializationthird-party-advisory
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