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Vulnerabilities

Vulnerability · CVE-2025-37730

Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in “client” mode, as hostname verification in TCP output was not being perf

Published May 6, 2025 · catalog updated May 6, 2025 · Elastic Logstash

Check if you run it

No confirmed exploitation is on record for CVE-2025-37730. EPSS is 0.18%. Act only if a listed version of Elastic Logstash is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Version ranges on file
Affected products
vendor Elastic Logstash 9.0.0 <9.0.1

Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in “client” mode, as hostname verification in TCP output was not being performed when the ssl_verification_mode => full was set.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Elastic Logstash 9.0.0 <9.0.19.0.0 <9.0.1

How to fix CVE-2025-37730

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-37730. EPSS is 0.18%. Act only if a listed version of Elastic Logstash is installed.

Which versions are affected?

Compare what you have installed with Elastic Logstash 9.0.0 <9.0.1 9.0.0 <9.0.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2025 · EUVD

    Detected

    Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in “client” mode, as hostname verification in TCP output was not being performed when the ssl_verification_mode => full was set.

  2. May 6, 2025 · EUVD

    Updated

    Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in “client” mode, as hostname verification in TCP output was not being performed when the ssl_verification_mode => full was set.

Sources

  • CVE.orgVulnerability recordCVE-2025-37730

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-37730

    30-day exploitation probability 0.2%

    first.org
  • EUVDVulnerability recordEUVD-2025-13629

    Improper certificate validation in Logstash's TCP output could lead to a man-in-the-middle (MitM) attack in “client” mode, as hostname verification in TCP output was not being performed when the ssl_verification_mode => full was set.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.