CVE-2021-21329

Name: CVE-2021-21329
Creator: NVD / NIST
Published: 2021-03-08T18:15:13.71+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.46%

Last modified Jun 17, 2026

CVE-2021-21329 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. RATCF is an open-source framework for hosting Cyber-Security Capture the Flag events. In affected versions of RATCF users with multi factor authentication enabled are able to log in without a valid token. EPSS estimates a 1.46% chance of exploitation in the next 30 days.

Description

RATCF is an open-source framework for hosting Cyber-Security Capture the Flag events. In affected versions of RATCF users with multi factor authentication enabled are able to log in without a valid token. This is fixed in commit cebb67b.

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

1.46%

70.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Ratcf	Ratcf	< 2021-02-26

References

https://github.com/ractf/core/commit/c57a4d186bfc586ad3edfe4dcba9f11efbf22f09#diff-60c444c47c061306f2dff5bf97c07810f40f949a8e94ecbb609b6b29364c8642R130-R152Patch, Third Party Advisory
https://github.com/ractf/core/commit/cebb67bd16a8296121201805332365ffccb29638Patch, Third Party Advisory
https://github.com/ractf/core/security/advisories/GHSA-fw57-f7mq-9q85Patch, Third Party Advisory
https://github.com/ractf/core/commit/c57a4d186bfc586ad3edfe4dcba9f11efbf22f09#diff-60c444c47c061306f2dff5bf97c07810f40f949a8e94ecbb609b6b29364c8642R130-R152Patch, Third Party Advisory
https://github.com/ractf/core/commit/cebb67bd16a8296121201805332365ffccb29638Patch, Third Party Advisory
https://github.com/ractf/core/security/advisories/GHSA-fw57-f7mq-9q85Patch, Third Party Advisory

Timeline

Published: Mar 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21329?

How severe is CVE-2021-21329?

CVE-2021-21329 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21329?

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-2021-21329?

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

Scan your code now

Source: NVD / NIST