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CVE-2025-59689: Libraesva Email Security Gateway Command Injection Vulnerability

criticalknown exploitedCVE-2025-59689
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Libraesva Email Security Gateway (ESG) contains a command injection vulnerability which allows command injection via a compressed e-mail attachment.

CSIRTS triage

vendor: Libraesvaproduct: Email Security GatewayRemote code execution
What
The vulnerability allows command injection via a compressed e-mail attachment.
Who is affected
Deployments of Libraesva Email Security Gateway that process compressed email attachments.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and rated critical.
Action
Update to the latest version of the Email Security Gateway.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-09-29
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-59689

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-59689coverage & exploitation statusNVD · CVE.org

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