What is the CVSS score of CVE-2025-59689?

CVE-2025-59689 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 6.9%.

Which versions of Email Security Gateway are affected by CVE-2025-59689?

Organizations using Libraesva ESG 4.5 through 5.5.x before 5.5.7 should be aware of moderate risk from CVE-2025-59689, a command injection vulnerability rated CVSS 6.1.

Is CVE-2025-59689 being actively exploited?

Yes, CVE-2025-59689 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

How to fix or mitigate CVE-2025-59689?

Within 24 hours: Identify affected systems and apply vendor patches immediately. Validate input sanitization for user-controlled parameters.

Email Security Gateway CVE-2025-59689

MEDIUM

Command Injection (CWE-77)

2025-09-19 cve@mitre.org

Command Injection Email Security Gateway

6.1

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:13 vuln.today

Added to CISA KEV

Nov 05, 2025 - 19:25 cisa

CISA KEV

CVE Published

Sep 19, 2025 - 20:15 nvd

MEDIUM 6.1

DescriptionNVD

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.

AnalysisAI

Libraesva ESG 4.5 through 5.5.x before 5.5.7 allows command injection via a compressed e-mail attachment. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Command Injection (CWE-77), which allows attackers to inject arbitrary commands into system command execution. 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. Affected products include: Libraesva Email Security Gateway. Version information: through 5.5..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use parameterized APIs, avoid shell execution, validate input with strict allowlists.

CVE-2025-59689 vulnerability details – vuln.today

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