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CVE-2025-59689

Libraesva Email Security Gateway Command Injection

6.1 MEDIUMActively exploited (CISA KEV)EPSS 1.86%
  1. Published19 Sept 2025
  2. Added to CISA KEV29 Sept 2025
  3. Remediation due20 Oct 2025
Actively exploited (CISA KEV)

Libraesva Email Security Gateway (ESG) contains a command injection vulnerability which allows command injection via a compressed e-mail attachment.

Added to KEV: 29 Sept 2025Federal remediation due: 20 Oct 2025

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Libraesva Email Security Gateway≥ 4.5 < 5.0.31 · ≥ 5.1.0 < 5.1.20 · ≥ 5.2.0 < 5.2.31 · ≥ 5.3.0 < 5.3.16

Remediation

Fixed in
Libraesva Email Security Gateway≥ 5.0.31

References

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Frequently asked

Is CVE-2025-59689 being actively exploited?

Yes. CVE-2025-59689 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 29 Sept 2025.

How severe is CVE-2025-59689?

CVE-2025-59689 has a CVSS 3.1 base score of 6.1, rated medium. EPSS estimates a 1.86% probability of exploitation.

Which products are affected by CVE-2025-59689?

Affected products include Libraesva Email Security Gateway.

How do I fix CVE-2025-59689?

Upgrade affected software to a fixed version, for example Libraesva Email Security Gateway 5.0.31 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-59689 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.