CVE-2025-34489 GFI MailEssentials < 21.8 Local Privilege Escalation
A local attacker can escalate privileges to SYSTEM by sending a crafted serialized payload to the .NET Remoting Service in GFI MailEssentials.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-34489?
CVE-2025-34489 is a high-severity unsafe deserialization vulnerability in GFI MailEssentials, published on 28 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue. A local attacker can escalate to NT Authority/SYSTEM by sending a crafted serialized payload to a .NET Remoting Service.
Weakness: CWE-502
Which versions are affected by CVE-2025-34489?
It affects 1 product.
Products include Gfi Mailessentials.
How do I fix CVE-2025-34489?
No fix has been published for CVE-2025-34489 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-34489 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34489 exists.
Other vulnerabilities in GFI MailEssentials
- CVE-2004-1312 Denial of service in n/a
- CVE-2025-34491 GFI MailEssentials < 21.8 MultiNode Insecure Deserialization
- CVE-2025-34490 GFI MailEssentials < 21.8 XXE Arbitrary File Read
- CVE-2026-23620 GFI MailEssentials AI < 22.4 ListServer.IsDBExist() Absolute Directory Traversal to File Enumeration
- CVE-2026-23621 GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration
Sources
Also known as GHSA-6h6j-8576-v4xg.