What’s Vulnerable › Vulnerabilities

CVE-2021-21329: Multi Factor Authentication Token Improperly Validated On User Login

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-08 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Ratcf: before 2021-02-26 — fixed in 2021-02-26

How to fix

Upgrade to a fixed version: Ratcf 2021-02-26. Check the vendor advisory for mitigations.

References

• https://github.com/ractf/core/commit/c57a4d186bfc586ad3edfe4dcba9f11efbf22f09#diff-60c444c47c061306f2dff5bf97c07810f40f949a8e94ecbb609b6b29364c8642R130-R152
• https://github.com/ractf/core/commit/cebb67bd16a8296121201805332365ffccb29638
• https://github.com/ractf/core/security/advisories/GHSA-fw57-f7mq-9q85
• https://github.com/ractf/core/commit/c57a4d186bfc586ad3edfe4dcba9f11efbf22f09#diff-60c444c47c061306f2dff5bf97c07810f40f949a8e94ecbb609b6b29364c8642R130-R152
• https://github.com/ractf/core/commit/cebb67bd16a8296121201805332365ffccb29638
• https://github.com/ractf/core/security/advisories/GHSA-fw57-f7mq-9q85

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