CVE-2021-21329 json
Multi Factor Authentication Token Improperly Validated On User Login
published 2021-03-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8674
- cvss
- 8.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.6%
- EPSS 1.6% chance of exploitation in 30 days, percentile 76%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- ratcf ratcf 2021-02-26
Exploit prediction
1.62% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- ractf core
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/ractf/core/commit/c57a4d186bfc586ad3edfe4dcba9f11efbf22f09#diff-60c444c47c061306f2dff5bf97c07810f40f949a8e94e
patch, third-party-advisory
-
github.com
/ractf/core/commit/cebb67bd16a8296121201805332365ffccb29638
patch, third-party-advisory
-
github.com
/ractf/core/security/advisories/GHSA-fw57-f7mq-9q85
patch, third-party-advisory
Sources
- CVE List CVE-2021-21329
- NVD CVE-2021-21329
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.