Actively exploited in the wild
Libraesva Email Security Gateway Command Injection Vulnerability
Libraesva - Email Security Gateway · Listed in the CISA KEV since 2025-09-29. This indicates confirmed attacks in production environments.
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.
CVE-2025-59689
MediumCVSS 6.1KEVSummary
Libraesva ESG 4.5 through 5.5.x before 5.5.7 allows command injection via a compressed e-mail attachment. Fixes are available for versions 5.0.31, 5.1.20, 5.2.31, 5.4.8, and 5.5.7.
Risk Assessment
The risk is potential remote command execution on the mail server, which could lead to full system compromise and data confidentiality breach.
Recommendation
Immediately update Libraesva ESG to a patched version and restrict acceptance of compressed attachments if possible.
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Original NVD description (English source)
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.