CVE-2021-43202

Name: CVE-2021-43202
Creator: NVD / NIST
Published: 2021-11-30T16:15:07.867+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.05%

Last modified Jun 17, 2026

CVE-2021-43202 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In JetBrains TeamCity before 2021.1.3, the X-Frame-Options header is missing in some cases.. EPSS estimates a 1.05% chance of exploitation in the next 30 days.

Description

In JetBrains TeamCity before 2021.1.3, the X-Frame-Options header is missing in some cases.

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

1.05%

60.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Jetbrains	Teamcity	< 2021.1.3

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 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43202?

In JetBrains TeamCity before 2021.1.3, the X-Frame-Options header is missing in some cases.

How severe is CVE-2021-43202?

CVE-2021-43202 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.05% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43202?

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-2021-43202?

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

Scan your code now

Source: NVD / NIST