Auth bypass in Red Hat Single Sign-On
CVE-2021-3424
A flaw was found in keycloak as shipped in Red Hat Single Sign-On 7.4 where IDN homograph attacks are possible. A malicious user can register himself with a name already registered and trick admin to grant him extra privileges.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (54.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Red Hat Single Sign-On — versions 7.4
- Keycloak — versions as shipped in Red Hat Single Sign-On 7.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-3424?
- CVE-2021-3424 is a medium-severity vulnerability in Red Hat Single Sign-On, classified under Improper Authentication. CVSS score: 5.3/10. Published 2021-06-01.
- How severe is CVE-2021-3424?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2021-3424 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.