8.8

CVE-2021-4133: redhat keycloak Incorrect Authorization

Modified
AliasesRHSA-2021:5218RHSA-2021:5219GHSA-83x4-9cwr-5487
Published 25-01-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-4133 is a high (CVSS 8.8) Incorrect Authorization vulnerability in redhat keycloak. EPSS estimates a 1.37% chance of exploitation in the next 30 days, higher than 72% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
1.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
RHSA-2022:0151RHSA-2022:0152

Timeline

  1. 25-01-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.37%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat3 products
  • keycloak≥ 12.0.0, < 15.1.1
  • rh-sso7-keycloak< 0:15.0.2-3.redhat_00002.1.el7sso | < 0:15.0.2-3.redhat_00002.1.el8sso
  • rh-sso7-keycloak-server< 0:15.0.2-3.redhat_00002.1.el7sso | < 0:15.0.2-3.redhat_00002.1.el8sso
Org.keycloak1 product
  • keycloak-services< 15.1.1

2 vendors · 4 products

References

14 links
Show all 14 references