Libraesva · Email Security Gateway

CVE-2025-59689

Libraesva Email Security Gateway Command Injection Vulnerability

Exploited in attacks Medium 6.1 Attack chance: 1.9%

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.

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

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.

Deadline for US federal agencies: October 20, 2025

Added to the CISA list: September 29, 2025
Published: September 19, 2025
Severity: Medium 6.1 CVSS 3.1
Chance of attacks in the next 30 days (EPSS): 1.9% in the top 20.8% of all known vulnerabilities
Weakness: CWE-77
More details: NVD · CVE.org · CISA

All references (2)

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.