Libraesva Email Security Gateway Command Injection Vulnerability

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

cat cve-2025-59689.json

Vendor: Libraesva
Product: Email Security Gateway
CVSS: 6.1
EPSS (exploit probability): 1.9%
Status: kev
CISA patch-by (BOD 22-01): October 20, 2025
Added to KEV: September 29, 2025
Source: https://nvd.nist.gov/vuln/detail/CVE-2025-59689

Is CVE-2025-59689 being exploited?

Yes. CISA added CVE-2025-59689 to its Known Exploited Vulnerabilities catalog on September 29, 2025. CISA only lists a CVE when it has reliable evidence of exploitation in the wild.

FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 1.9% (scored October 14, 2026).

CISA KEV[ LISTED ]
ENISA EUVD (exploited)[ — ]
CIRCL KEV[ — ]

Catalog snapshot 2026-10-23. Full cross-catalog view: /kev-comparison

CVE-2025-59689 timeline

2025-09-19Published to NVD
2025-09-29Added to CISA KEV+10d

Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON

What to do

CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

US federal civilian agencies must remediate by October 20, 2025 (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.