---
title: "CVE-2025-59689: Libraesva Email Security Gateway Command Injection Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-59689/
description: "CVE-2025-59689 (Libraesva Email Security Gateway): Exploited in the wild (CISA KEV). Libraesva ESG 4.5 through 5.5.x before 5.5.7 allows command injection…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-09-19
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-59689"
kev: true
cvss: 6.1
epss: 0.01864
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-59689: Libraesva Email Security Gateway Command Injection Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Libraesva Email Security Gateway. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-09-29, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-10-20 ; treat that as the outer limit, not the target.
- EPSS 1.9% , percentile 79: FIRST’s model estimates a 1.9% chance of exploitation activity in the next 30 days, higher than 79% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## 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.

## Affected products (CVE record)

- Libraesva Email Security Gateway: 4.5 < 5.0.31, 5.1 < 5.1.20, 5.2 < 5.2.31, 5.3 < 5.4.8, 5.5 < 5.5.7

## Severity

- mitre CVSS 3.1: 6.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`

## Exploitation

- CISA KEV: added 2025-09-29; federal due date 2025-10-20. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.86% probability of exploitation activity in the next 30 days; percentile 79.

## Sources

- [Listed in CISA KEV notes (docs.libraesva.com)](https://docs.libraesva.com/knowledgebase/security-advisory-command-injection-vulnerability-cve-2025-59689/)
- [CVE.org record CVE-2025-59689](https://www.cve.org/CVERecord?id=CVE-2025-59689)
- [NVD entry CVE-2025-59689](https://nvd.nist.gov/vuln/detail/CVE-2025-59689)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59689)
- [libraesva.com](https://www.libraesva.com/security-blog/)

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Source page: https://erroneo.us/security/cve/CVE-2025-59689/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt