CVE-2021-22138

3.7 lowEPSS 0.5%

Low (3.7) in elastic logstash. 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.

Severity

CVSS 3.1

3.7 low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWE: CWE-295
Published: 2021-05-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

elastic:logstash

References

https://discuss.elastic.co/t/elastic-stack-7-12-0-and-6-8-15-security-update/268125
https://security.netapp.com/advisory/ntap-20210629-0001/
https://discuss.elastic.co/t/elastic-stack-7-12-0-and-6-8-15-security-update/268125
https://security.netapp.com/advisory/ntap-20210629-0001/

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