CVE-2021-43185

Name: CVE-2021-43185
Creator: NVD / NIST
Published: 2021-11-09T15:15:08.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.94%

Last modified Jun 17, 2026

CVE-2021-43185 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. JetBrains YouTrack before 2021.3.23639 is vulnerable to Host header injection.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

JetBrains YouTrack before 2021.3.23639 is vulnerable to Host header injection.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.94%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Jetbrains	Youtrack	< 2021.3.23639

References

https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/Vendor Advisory
https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/Vendor Advisory

Timeline

Published: Nov 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43185?

JetBrains YouTrack before 2021.3.23639 is vulnerable to Host header injection.

How severe is CVE-2021-43185?

CVE-2021-43185 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43185?

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-2021-43185?

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

Scan your code now

Source: NVD / NIST