CVE-2021-22138

Name: CVE-2021-22138
Creator: NVD / NIST
Published: 2021-05-13T18:15:09.077+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2021-22138 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. 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. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

3.7/10

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

EPSS Probability

0.46%

36.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Elastic	Logstash	>= 6.4.0, < 6.8.15
Elastic	Logstash	>= 7.0.0, < 7.12.0

References

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

Timeline

Published: May 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22138?

How severe is CVE-2021-22138?

CVE-2021-22138 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22138?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22138?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST