Deserialization in Gfi Mailessentials
CVE-2025-34489
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (25.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Gfi Mailessentials — versions 0
Weakness classification (CWE)
References
- frycos.github.io/vulns4free/2025/04/28/mailessentials.html (Exploit, technical-description, exploit)
- gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resourc… (vendor-advisory, Release Notes)
- www.vulncheck.com/advisories/gfi-mailessentials-local-privilege-escalation (third-party-advisory)
Frequently asked questions
- What is CVE-2025-34489?
- CVE-2025-34489 is a high-severity vulnerability in Gfi Mailessentials, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2025-04-28.
- How severe is CVE-2025-34489?
- High severity. CVSS v3 base score is 7.8 out of 10.