CVE-2025-59689

MEDIUM6.1

CISA KEV

Published 2025-09-19 · Updated 2026-06-17 · Source cve@mitre.org

Summary

CVE-2025-59689 is a medium-severity (CVSS 6.1) vulnerability in Libraesva Email Security Gateway. CISA added it to the Known Exploited Vulnerabilities catalog on September 29, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 20, 2025. CISA does not currently list it as used in ransomware campaigns.

All 1 known-exploited Libraesva vulnerabilities →

Description

Libraesva ESG 4.5 through 5.5.x before 5.5.7 allows command injection via a compressed e-mail attachment. For ESG 5.0 a fix has been released in 5.0.31. For ESG 5.1 a fix has been released in 5.1.20. For ESG 5.2 a fix has been released in 5.2.31. For ESG 5.4 a fix has been released in 5.4.8. For ESG 5.5. a fix has been released in 5.5.7.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-77

CISA Known-Exploited Vulnerability

Product: Libraesva — Email Security Gateway

Name: Libraesva Email Security Gateway Command Injection Vulnerability

Date added: 2025-09-29 · Due: 2025-10-20

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

View on NVD

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