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CVE-2021-4133

8.8 · HIGH

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 ev…

Published Jan 25, 2022CWE-863EPSS 1.37%

Overview

CVE-2021-4133 is a high-severity vulnerability. It was published on January 25, 2022 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.redhat.com/show_bug.cgi?id=2033602GitHubgithub.com/keycloak/keycloak/issues/9247GitHubgithub.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487Refwww.oracle.com/security-alerts/cpuapr2022.htmlRefbugzilla.redhat.com/show_bug.cgi?id=2033602GitHubgithub.com/keycloak/keycloak/issues/9247GitHubgithub.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487Refwww.oracle.com/security-alerts/cpuapr2022.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4133?

CVE-2021-4133 is a high-severity vulnerability. It was published on January 25, 2022 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-4133?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-4133?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-4133?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4133 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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