CVE-2021-3637
Allocation of resources without limits or throttling in keycloak-model-infinispan
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
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
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
- Record
CVE-2021-3637- 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 - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-770
- Updated
- 2026-11-02
CVE List No score
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
- Record
CVE-2021-3637- Weakness
- CWE-770
- Updated
- 2026-11-02
EUVDEUVD-2021-1434 No score
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
- Record
EUVD-2021-1434- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2vp8-jv5v-6qh6
Allocation of resources without limits or throttling in keycloak-model-infinispan
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
- Record
GHSA-2vp8-jv5v-6qh6- 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 - Weakness
- CWE-770
- Updated
- 2026-11-02
OSV
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
- Record
CVE-2021-3637- 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
OSVGHSA-2vp8-jv5v-6qh6
Allocation of resources without limits or throttling in keycloak-model-infinispan
A flaw was found in keycloak-model-infinispan in keycloak versions before 14.0.0 where authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly which could lead to a DoS attack.
- Record
GHSA-2vp8-jv5v-6qh6- 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 - Weakness
- CWE-770
- 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-model-infinispanMaven |
before 14.0.0 | 14.0.0 |
org.keycloak:keycloak-model-infinispanMaven |
before 14.0.0, plus listed versions 1.9.0.CR11.9.0.Final1.9.1.Final1.9.2.Final1.9.3.Final Show 45 moreShow less1.9.4.Final1.9.5.Final1.9.7.Final1.9.8.Final10.0.010.0.110.0.211.0.011.0.111.0.211.0.312.0.012.0.112.0.212.0.312.0.413.0.013.0.12.0.0.CR12.0.0.Final2.1.0.CR12.1.0.Final2.2.0.CR12.2.0.Final2.2.1.Final2.3.0.CR12.3.0.Final2.4.0.CR12.4.0.Final2.5.0.CR12.5.0.Final2.5.1.Final2.5.4.Final2.5.5.Final3.0.0.CR13.0.0.Final3.1.0.CR13.1.0.Final3.2.0.CR13.2.0.Final3.2.1.Final3.3.0.CR13.3.0.CR23.3.0.Final3.4.0.CR1 |
14.0.0 |
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 | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3637 is a high vulnerability (CVSS 7.5) in Redhat Keycloak, published July 9, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.13%, the 66th percentile. Fixed in org.keycloak:keycloak-model-infinispan 14.0.0.
References
bugzilla.redhat.com/show_bug.cgi?id=1979638
nvd.nist.gov/vuln/detail/CVE-2021-3637
github.com/advisories/GHSA-2vp8-jv5v-6qh6
access.redhat.com/errata/RHSA-2021:3527
Show 24 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: 32 versions. The JSON record has them.