Search for vulnerabilities
Vulnerability details: VCID-z3cr-n3zh-2fbn
Vulnerability ID VCID-z3cr-n3zh-2fbn
Aliases CVE-2021-3637
GHSA-2vp8-jv5v-6qh6
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-770 Allocation of Resources Without Limits or Throttling
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3637.json
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
epss 0.00409 https://api.first.org/data/v1/epss?cve=CVE-2021-3637
cvssv3.1 7.5 https://bugzilla.redhat.com/show_bug.cgi?id=1979638
generic_textual HIGH https://bugzilla.redhat.com/show_bug.cgi?id=1979638
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-2vp8-jv5v-6qh6
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-3637
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-3637
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-3637
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3637.json
https://api.first.org/data/v1/epss?cve=CVE-2021-3637
https://bugzilla.redhat.com/show_bug.cgi?id=1979638
https://nvd.nist.gov/vuln/detail/CVE-2021-3637
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
GHSA-2vp8-jv5v-6qh6 https://github.com/advisories/GHSA-2vp8-jv5v-6qh6
RHSA-2021:3527 https://access.redhat.com/errata/RHSA-2021:3527
RHSA-2021:3528 https://access.redhat.com/errata/RHSA-2021:3528
RHSA-2021:3529 https://access.redhat.com/errata/RHSA-2021:3529
RHSA-2021:3534 https://access.redhat.com/errata/RHSA-2021:3534
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3637.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://bugzilla.redhat.com/show_bug.cgi?id=1979638
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3637
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3637
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.60417
EPSS Score 0.00409
Published At Aug. 17, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:52:30.537459+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/07/GHSA-2vp8-jv5v-6qh6/GHSA-2vp8-jv5v-6qh6.json 37.0.0