Vulnerability in Elastic Logstash
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 performed when the ssl_verification_mode => full was set.
Vulnerability class: Improper Certificate Validation
EPSS: 0.001 (25.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Elastic Logstash — versions 8.0.0, 8.18.0, 9.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-37730?
- CVE-2025-37730 is a medium-severity vulnerability in Elastic Logstash, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2025-05-06.
- How severe is CVE-2025-37730?
- Medium severity. CVSS v3 base score is 6.5 out of 10.