CVE-2025-59689

Libraesva Email Security Gateway Command Injection Vulnerability

Medium 6.1
Exploited: added to CISA KEV 29 Sep 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.

Key facts

Published: 19 Sep 2025
Last changed: 26 Feb 2026
Assigned by: mitre
KEV added: 29 Sep 2025
KEV fix due: 20 Oct 2025
EPSS: 1.956% likely to be exploited in the next 30 days, higher than 80.612% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

6.1CVSS 3.1, Mediumfrom the CNA (mitre)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
Libraesva	Email Security Gateway	Default status: unaffected 4.5 up to but excluding 5.0.31 (affected) 5.1 up to but excluding 5.1.20 (affected) 5.2 up to but excluding 5.2.31 (affected) 5.3 up to but excluding 5.4.8 (affected) 5.5 up to but excluding 5.5.7 (affected)