Libraesva Email Security Gateway Command Injection Vulnerability
Libraesva — Email Security Gateway
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.
6.1
1.9%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Published
- Sep 19, 2025
- Modified
- Feb 26, 2026
- Added to KEV
- Sep 29, 2025
- Federal patch due
- Oct 20, 2025
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2025-59689, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2025-59689 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2025-59689?
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.
How severe is CVE-2025-59689?
CVE-2025-59689 has a CVSS base score of 6.1 out of 10 (CVSS 3.1).
Is CVE-2025-59689 actively exploited in the wild?
Yes. CVE-2025-59689 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Sep 29, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-59689?
1.9% - meaning FIRST.org's EPSS model estimates a 1.9% probability this vulnerability will be exploited in the wild within 30 days (78% percentile among all scored CVEs).
What type of vulnerability is CVE-2025-59689?
CVE-2025-59689 is classified under CWE-77 (CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')).
Cross-checked against
Impactr finds and proves whether CVE-2025-59689 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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