CVE-2025-37730

Logstash Improper Certificate Validation in TCP output

State: Published
Severity: 6.5 Medium
Published: May 6, 2025
Updated: May 6, 2025
Reserved: Apr 16, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N	elastic

Weaknesses

CWE-295

Affected Products

Product	Versions
LogstashElastic	8.0.0 to before 8.17.6Affected 8.18.0 to before 8.18.1Affected 9.0.0 to before 9.0.1Affected

References

https://discuss.elastic.co/t/logstash-8-17-6-8-18-1-and-9-0-1-security-update-esa-2025-08/377869

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