Auth bypass in Red Hat Keycloak
CVE-2021-4133
A flaw was found in Keycloak in versions from 12.0.0 and before 15.1.1 which allows an attacker with any existing user account to create new default user accounts via the administrative REST API even when new user registration is disabled.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.014 (71.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Red Hat Keycloak
- Keycloak — versions keycloak 15.1.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- github.com/keycloak/keycloak/issues/9247 (Third Party Advisory)
- github.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487 (Third Party Advisory)
- www.oracle.com/security-alerts/cpuapr2022.html (Not Applicable)
Frequently asked questions
- What is CVE-2021-4133?
- CVE-2021-4133 is a high-severity vulnerability in Red Hat Keycloak, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2022-01-25.
- How severe is CVE-2021-4133?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-4133 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.