Known exploited vulnerability
CVE-2025-59689
The short answer
CVE-2025-59689 affects Libraesva Email Security Gateway and is rated medium (CVSS 6.1). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-09-29: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-77.
Severity
6.1 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploited (CISA KEV)
Yes, since Sep 29, 2025
Federal due date Oct 20, 2025
EPSS, next 30 days
2.0%
Higher than 80% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Email Security Gateway. NVD's record lists the exact affected versions.
References
- docs.libraesva.com/knowledgebase/security-advisory-command-injection-vulnerability-cve-2025-59689/ Vendor Advisory
- www.libraesva.com/security-blog/ Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59689 US Government Resource
Questions
Is CVE-2025-59689 being exploited?
Yes. CISA added CVE-2025-59689 to its Known Exploited Vulnerabilities catalog on 2025-09-29, with a federal remediation due date of 2025-10-20.
How do I fix CVE-2025-59689?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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