Is CVE-2021-4133 in the CISA KEV catalog?

No. CVE-2021-4133 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4133?

CVE-2021-4133 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-4133?

CVE-2021-4133 has an EPSS score of 1.35% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4133?

Upgrade keycloak to 15.1.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-4133

HIGH

8.8

CVSS v3

NVD

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.

CWE-863Incorrect Authorization

How to fix

Remediation Available

keycloakNVD

Affected:>= 12.0.0, < 15.1.1Fixed in:15.1.1CVE-2021-4133derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.35%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

References

Third-Party Advisory3

Other references1

oracle.com

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

Embed a live status badge for CVE-2021-4133

Markdown

[![CVE-2021-4133](https://tridentstack.com/cve/badge/CVE-2021-4133.svg)](https://tridentstack.com/cve/CVE-2021-4133)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-4133"><img src="https://tridentstack.com/cve/badge/CVE-2021-4133.svg" alt="CVE-2021-4133"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.