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Fencer Vulns
high 7.5

CVE-2021-3637 json

Allocation of resources without limits or throttling in keycloak-model-infinispan

published 2021-07-09 5 y ago modified 2026-06-17 4 mo ago also GHSA-2vp8-jv5v-6qh6 , EUVD-2021-1434

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.keycloak:keycloak-model-infinispan 14.0.0
  • redhat keycloak 14.0.0
  • rh-sso7-keycloak red hat single sign on 7 9.0.15-1.redhat_00002.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.15-1.redhat_00002.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7 9.0.15-1.redhat_00002.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.15-1.redhat_00002.1.el7sso
  • rh-sso7-keycloak red hat single sign on 7 9.0.15-1.redhat_00002.1.el6sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.15-1.redhat_00002.1.el6sso

red hat advisories RHSA-2021:3529RHSA-2021:3528RHSA-2021:3527

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3637 updated cvss 7.5

keycloak-model-infinispan: authenticationSessions map in RootAuthenticationSessionEntity grows boundlessly could lead to a DoS attack

  • Red Hat Single Sign-On 7.4 for RHEL 6 Server rh-sso7-keycloak 9.0.15-1.redhat_00002.1.el6sso, rh-sso7-keycloak-server 9.0.15-1.redhat_00002.1.el6sso
    fixed: vendor fix RHSA-2021:3527
  • Red Hat Single Sign-On 7.4 for RHEL 7 Server rh-sso7-keycloak 9.0.15-1.redhat_00002.1.el7sso, rh-sso7-keycloak-server 9.0.15-1.redhat_00002.1.el7sso
    fixed: vendor fix RHSA-2021:3528
  • Red Hat Single Sign-On 7.4 for RHEL 8 rh-sso7-keycloak 9.0.15-1.redhat_00002.1.el8sso, rh-sso7-keycloak-server 9.0.15-1.redhat_00002.1.el8sso
    fixed: vendor fix RHSA-2021:3529
  • Red Hat Single Sign-On 7.4.9
    fixed: vendor fix RHSA-2021:3534

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-model-infinispan
<14.0.0
14.0.0

Affected products

  • n/a keycloak-model-infinispan

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.