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CVE-2025-37730

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Date: May 6, 2025

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.

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2025-37730
https://discuss.elastic.co/t/logstash-8-17-6-8-18-1-and-9-0-1-security-update-esa-2025-08/377869
https://www.mend.io/vulnerability-database/CVE-2025-37730

Severity Score

Weakness Type (CWE)

Improper Certificate Validation

CWE-295

Top Fix

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Upgrade Version

Upgrade to version https://github.com/elastic/logstash.git - v8.17.6;https://github.com/elastic/logstash.git - v8.18.1;https://github.com/elastic/logstash.git - v9.0.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): LOW
Availability (A): NONE

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