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Vulnerability details: VCID-1rh2-4svp-xffr
Vulnerability ID VCID-1rh2-4svp-xffr
Aliases CVE-2023-6563
GHSA-54f3-c6hg-865h
Summary Allocation of Resources Without Limits in Keycloak An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). If an attacker creates two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.
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
cvssv3.1 7.7 https://access.redhat.com/errata/RHSA-2023:7854
generic_textual HIGH https://access.redhat.com/errata/RHSA-2023:7854
cvssv3.1 7.7 https://access.redhat.com/errata/RHSA-2023:7855
generic_textual HIGH https://access.redhat.com/errata/RHSA-2023:7855
cvssv3.1 7.7 https://access.redhat.com/errata/RHSA-2023:7856
generic_textual HIGH https://access.redhat.com/errata/RHSA-2023:7856
cvssv3.1 7.7 https://access.redhat.com/errata/RHSA-2023:7857
generic_textual HIGH https://access.redhat.com/errata/RHSA-2023:7857
cvssv3.1 7.7 https://access.redhat.com/errata/RHSA-2023:7858
generic_textual HIGH https://access.redhat.com/errata/RHSA-2023:7858
cvssv3 7.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6563.json
cvssv3.1 7.7 https://access.redhat.com/security/cve/CVE-2023-6563
generic_textual HIGH https://access.redhat.com/security/cve/CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2023-6563
cvssv3.1 7.7 https://bugzilla.redhat.com/show_bug.cgi?id=2253308
generic_textual HIGH https://bugzilla.redhat.com/show_bug.cgi?id=2253308
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-54f3-c6hg-865h
cvssv3.1 7.7 https://github.com/keycloak/keycloak
generic_textual HIGH https://github.com/keycloak/keycloak
cvssv3.1 7.7 https://github.com/keycloak/keycloak/commit/556146f961f7c8ddf64de15e2117a58d045f72b5
generic_textual HIGH https://github.com/keycloak/keycloak/commit/556146f961f7c8ddf64de15e2117a58d045f72b5
cvssv3.1 7.7 https://github.com/keycloak/keycloak/issues/13340
generic_textual HIGH https://github.com/keycloak/keycloak/issues/13340
cvssv3.1 7.7 https://github.com/keycloak/keycloak/pull/15463
generic_textual HIGH https://github.com/keycloak/keycloak/pull/15463
cvssv3.1 7.7 https://nvd.nist.gov/vuln/detail/CVE-2023-6563
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2023-6563
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2023:7854
https://access.redhat.com/errata/RHSA-2023:7855
https://access.redhat.com/errata/RHSA-2023:7856
https://access.redhat.com/errata/RHSA-2023:7857
https://access.redhat.com/errata/RHSA-2023:7858
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6563.json
https://access.redhat.com/security/cve/CVE-2023-6563
https://api.first.org/data/v1/epss?cve=CVE-2023-6563
https://bugzilla.redhat.com/show_bug.cgi?id=2253308
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/556146f961f7c8ddf64de15e2117a58d045f72b5
https://github.com/keycloak/keycloak/issues/13340
https://github.com/keycloak/keycloak/pull/15463
https://nvd.nist.gov/vuln/detail/CVE-2023-6563
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:-:*:*:*:text-only:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:*
GHSA-54f3-c6hg-865h https://github.com/advisories/GHSA-54f3-c6hg-865h
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2023:7854
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2023:7855
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2023:7856
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2023:7857
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2023:7858
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-6563.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:L/UI:N/S:C/C:N/I:N/A:H Found at https://access.redhat.com/security/cve/CVE-2023-6563
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://bugzilla.redhat.com/show_bug.cgi?id=2253308
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak/commit/556146f961f7c8ddf64de15e2117a58d045f72b5
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak/issues/13340
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak/pull/15463
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:L/UI:N/S:C/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2023-6563
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 0.53212
EPSS Score 0.00304
Published At Aug. 5, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:42:11.691264+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-54f3-c6hg-865h/GHSA-54f3-c6hg-865h.json 37.0.0