CVE-2021-22138: Elastic Logstash

Low severity, CVSS 3.7. EPSS: 0.5% chance of exploitation in the next 30 days.

In Logstash versions after 6.4.0 and before 6.8.15 and 7.12.0 a TLS certificate validation flaw was found in the monitoring feature. When specifying a trusted server CA certificate Logstash would not properly verify the certificate returned by the monitoring server. This could result in a man in the middle style attack against the Logstash monitoring data.

Affected products

• Elastic Logstash: from 6.4.0, before 6.8.15 (fixed in 6.8.15); from 7.0.0, before 7.12.0 (fixed in 7.12.0)

Published 2021-05-13. Last modified 2026-06-17.