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Exploited vulnerability · CISA KEV

Is CVE-2025-59689 exploited? Yes: in CISA KEV since 29 Sep 2025

Gociux · Libraesva Email Security Gateway · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-59689, Libraesva Email Security Gateway Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 29 Sep 2025, 10 days after it was published. It affects Libraesva Email Security Gateway. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 29 Sep 2025
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity6.1CVSS 3.1 · medium
US federal due20 Oct 2025BOD 22-01 deadline

What it is

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

VendorLibraesva (1 exploited CVE in KEV)
ProductEmail Security Gateway
VulnerabilityLibraesva Email Security Gateway Command Injection Vulnerability
WeaknessCWE-77
Published19 Sep 2025
Added to KEV29 Sep 2025
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Email Security Gateway in your asset inventory, including appliances and cloud images. Stack check lists every exploited Libraesva CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 19 Sep 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Libraesva.

References

Questions

Is CVE-2025-59689 being exploited?

Yes. CISA added CVE-2025-59689 to the Known Exploited Vulnerabilities catalog on 29 Sep 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-59689 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-59689?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Libraesva's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Email Security Gateway and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2025 · act-now radar.

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