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MEDIUM: 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:NDefault status
unaffected
8.0.0 (semver) before 8.17.6
affected
8.18.0 (semver) before 8.18.1
affected
9.0.0 (semver) before 9.0.1
affected
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.
Problem types
Product status
8.0.0 (semver) before 8.17.6
8.18.0 (semver) before 8.18.1
9.0.0 (semver) before 9.0.1
References
discuss.elastic.co/...0-1-security-update-esa-2025-08/377869