CVE-2021-3513
Incorrect implementation of lockout feature in Keycloak
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
- Record
CVE-2021-3513- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-522, CWE-209
- Updated
- 2026-11-02
CVE List No score
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
- Record
CVE-2021-3513- Weakness
- CWE-522
- Updated
- 2026-11-02
EUVDEUVD-2022-6648 No score
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
- Record
EUVD-2022-6648- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xv7h-95r7-595j
Incorrect implementation of lockout feature in Keycloak
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
- Record
GHSA-xv7h-95r7-595j- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-209, CWE-522
- Updated
- 2026-11-02
OSV
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
- Record
CVE-2021-3513- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-xv7h-95r7-595j
Incorrect implementation of lockout feature in Keycloak
A flaw was found in keycloak where a brute force attack is possible even when the permanent lockout feature is enabled. This is due to a wrong error message displayed when wrong credentials are entered. The highest threat from this vulnerability is to confidentiality.
- Record
GHSA-xv7h-95r7-595j- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-209, CWE-522
- Updated
- 2026-11-02
OSVRHSA-2021:3527
Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 6
- Record
RHSA-2021:3527- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVRHSA-2021:3528
Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 7
- Record
RHSA-2021:3528- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVRHSA-2021:3529
Red Hat Security Advisory: Red Hat Single Sign-On 7.4.9 security update on RHEL 8
- Record
RHSA-2021:3529- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.keycloak:keycloak-parentMaven |
before 13.0.0 | 13.0.0 |
org.keycloak:keycloak-parentMaven |
before 13.0.0, plus listed versions 1.0-alpha-11.0-alpha-1-120620131.0-alpha-21.0-alpha-31.0-alpha-4 Show 45 moreShow less1.0-beta-11.0-beta-1-201505211.0-beta-1-201505231.0-beta-21.0-beta-31.0-beta-41.0-final1.0-rc-11.0-rc-21.0.1.Final1.0.2.Final1.0.3.Final1.0.4.Final1.0.5.Final1.1.0.Beta11.1.0.Beta21.1.0.Final1.1.1.Final1.2.0.Beta11.2.0.CR11.2.0.Final1.3.0.Final1.3.1.Final1.4.0.Final1.5.0-Final1.5.0.Final1.5.1.Final1.6.0.Final1.6.1.Final1.7.0.CR11.7.0.Final1.8.0.Alpha11.8.0.CR11.8.0.CR21.8.0.CR31.8.0.Final1.8.1.Final1.9.0.CR11.9.0.Final1.9.1.Final1.9.2.Final1.9.3.Final1.9.4.Final1.9.5.Final1.9.7.Final |
13.0.0 |
rh-sso7-keycloakRed Hat:red_hat_single_sign_on:7::el6 From an advisory covering 5 CVEs |
before 0:9.0.15-1.redhat_00002.1.el6sso | 0:9.0.15-1.redhat_00002.1.el6sso |
rh-sso7-keycloak-serverRed Hat:red_hat_single_sign_on:7::el6 From an advisory covering 5 CVEs |
before 0:9.0.15-1.redhat_00002.1.el6sso | 0:9.0.15-1.redhat_00002.1.el6sso |
rh-sso7-keycloakRed Hat:red_hat_single_sign_on:7::el7 From an advisory covering 5 CVEs |
before 0:9.0.15-1.redhat_00002.1.el7sso | 0:9.0.15-1.redhat_00002.1.el7sso |
rh-sso7-keycloak-serverRed Hat:red_hat_single_sign_on:7::el7 From an advisory covering 5 CVEs |
before 0:9.0.15-1.redhat_00002.1.el7sso | 0:9.0.15-1.redhat_00002.1.el7sso |
rh-sso7-keycloakRed Hat:red_hat_single_sign_on:7::el8 From an advisory covering 5 CVEs |
before 0:9.0.15-1.redhat_00002.1.el8sso | 0:9.0.15-1.redhat_00002.1.el8sso |
rh-sso7-keycloak-serverRed Hat:red_hat_single_sign_on:7::el8 From an advisory covering 5 CVEs |
before 0:9.0.15-1.redhat_00002.1.el8sso | 0:9.0.15-1.redhat_00002.1.el8sso |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3513 is a high vulnerability (CVSS 7.5) in Keycloak, published August 22, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. Fixed in org.keycloak:keycloak-parent 13.0.0.
References
bugzilla.redhat.com/show_bug.cgi?id=1953439
access.redhat.com/security/cve/CVE-2021-3513
nvd.nist.gov/vuln/detail/CVE-2021-3513
github.com/keycloak/keycloak/pull/7976
Show 26 moreShow less
security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3527.json
cve.org/CVERecord?id=CVE-2020-28491
snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONDATAFORMAT-1047329
Left out here: 72 versions. The JSON record has them.