CVE-2025-59689
Libraesva — Libraesva Email Security Gateway Command Injection Vulnerability
Libraesva · CWE-77 · in CISA KEV since 2025-09-29
EVRS 75 of 100 Urgent
Patch This Cycle
Rank 1,239 of 2,960 tracked
Raised to the floor for a confirmed exploited vulnerability.
Why it scores 75
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and an EPSS probability of 0.019.
- CISA KEVApplied
- RansomwareDid not apply
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
- docs.libraesva.com/…/security-advisory-command-injection-vulnerability-cve-2025-59689
- nvd.nist.gov/…/CVE-2025-59689
Fixed in
email security gateway: update to 5.0.31 or later | email security gateway: update to 5.1.20 or later | email security gateway: update to 5.2.31 or later | email security gateway: update to 5.3.16 or later | email security gateway: update to 5.4.8 or later | email security gateway: update to 5.5.7 or later
Affected versions
- 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>= 5.4.0 < 5.4.8>= 5.5.0 < 5.5.7
Remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 6.1 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.019 (79.1st pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Unknown or none | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2025-10-20 · KEV since 2025 · listed over a year | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | None known | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 6.1 (v3.1), assigned by mitre. | Listed | ENISA EUVD |
Description
NVDLibraesva 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.
What CISA says to do