7.8

CVE-2025-34489: gfi mailessentials Deserialization of Untrusted Data

CVSS: 7.8v3.1HighModified
Published 28-04-2025Last modified 19-11-2025
Open JSON

Vulnerability summary

CVE-2025-34489 is a high (CVSS 7.8) Deserialization of Untrusted Data vulnerability in gfi mailessentials. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.3% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
41/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 28-04-2025
    PublishedVulnerability first disclosed.
  2. 19-11-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

+0.01 pp

From 0.31% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (frycos.github.io)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Gfi1 product

1 vendor · 1 product

References

3 links