CVE-2021-22143

Name: CVE-2021-22143
Creator: NVD / NIST
Published: 2023-11-22T02:15:41.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.61%

Last modified Jun 17, 2026

CVE-2021-22143 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. The Elastic APM .NET Agent can leak sensitive HTTP header information when logging the details during an application error. Normally, the APM agent will sanitize sensitive HTTP header details before sending the information to the APM server. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

The Elastic APM .NET Agent can leak sensitive HTTP header information when logging the details during an application error. Normally, the APM agent will sanitize sensitive HTTP header details before sending the information to the APM server. During an application error it is possible the headers will not be sanitized before being sent.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.61%

44.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Elastic	Apm .Net Agent	< 1.10.0

References

https://discuss.elastic.co/t/elastic-apm-net-agent-1-10-0-security-update/274668Vendor Advisory
https://www.elastic.co/community/securityVendor Advisory
https://discuss.elastic.co/t/elastic-apm-net-agent-1-10-0-security-update/274668Vendor Advisory
https://www.elastic.co/community/securityVendor Advisory

Timeline

Published: Nov 22, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22143?

How severe is CVE-2021-22143?

CVE-2021-22143 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22143?

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-2021-22143?

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

Scan your code now

Source: NVD / NIST