Actively exploited · Published Sep 19, 2025 · Assigned by mitre
CVE-2025-59689
Medium 6.1 Exploited
In plain English
A medium-severity command injection in Email Security Gateway from Libraesva. Attackers are actively exploiting it in the wild (listed by CISA on September 29, 2025). The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 80% of all known vulnerabilities). 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 guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Oct 20, 2025.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Libraesva | Email Security Gateway | 4.5 – before 5.0.315.1 – before 5.1.205.2 – before 5.2.315.3 – before 5.4.85.5 – before 5.5.7 |
Weakness: CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N