PT-2025-18107 · Gfi · Gfi Mailessentials

Frycos · Published 2025-04-28 · Updated 2025-04-29 · CVE-2025-34491

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions GFI MailEssentials versions prior to 21.8

Description The issue is related to a .NET deserialization problem. A remote and authenticated attacker can execute arbitrary code by sending crafted serialized .NET data when joining a Multi-Server setup.

Recommendations For GFI MailEssentials versions prior to 21.8, update to version 21.8 or later to resolve the issue. As a temporary workaround, consider restricting access to the Multi-Server setup to minimize the risk of exploitation.

Exploit

Fix

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2025-34491

Affected Products

Gfi Mailessentials

References · 12

• 🔥 https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html · Exploit
• https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-34491 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-34491 · Security Note
• https://t.me/cvedetector/23952 · Telegram Post
• https://t.me/cvetracker/22560 · Telegram Post
• https://twitter.com/cybercronai/status/1917226250474606981 · Twitter Post
• https://vulncheck.com/advisories/gfi-mailessentials-multinode-insecure-deserialization · Note
• https://twitter.com/CVEnew/status/1916939703124898244 · Twitter Post
• https://twitter.com/CveFindCom/status/1916938647787495835 · Twitter Post
• https://twitter.com/CVETracker/status/1917308092510843360 · Twitter Post
• https://twitter.com/cybercronai/status/1917289153877647507 · Twitter Post