CVE-2023-6544

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 1.1% (63rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.1%
EPSS %ILE
63rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 25, 2024

Last Modified

April 15, 2026

References (18)

Vendor Advisories for CVE-2023-6544(7)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkeycloak-core2024-04-16redhat
redhatrh-sso7-keycloak-0:18.0.13-1.redhat_00001.1.el7sso2024-04-16redhat
redhatrh-sso7-keycloak-0:18.0.13-1.redhat_00001.1.el8sso2024-04-16redhat
redhatrh-sso7-keycloak-0:18.0.13-1.redhat_00001.1.el9sso2024-04-16redhat
redhatrh-sso-7/sso76-openshift-rhel8:7.6-462024-04-16redhat
redhatrh-sso7-keycloak2024-04-16redhat
redhatrhbk/keycloak-rhel9-operator:22-162024-04-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.keycloak:keycloak-services23.0.0 ... 24.0.2 (11 versions)
  • every version up to 22.0.10: fixed in 22.0.10
  • 23.0.0 up to 24.0.3: fixed in 24.0.3
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 191 total refreshes for this CVE.

  1. 2026-10-09 20:05 UTCEPSS rescore
  2. 2026-10-08 17:06 UTCEPSS rescore
  3. 2026-10-07 23:46 UTCEPSS rescore
  4. 2026-10-07 13:54 UTCOSV refresh
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  9. 2026-10-01 19:48 UTCEPSS rescore
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  11. 2026-09-30 16:39 UTCEG score recompute
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  22. 2026-09-18 19:26 UTCEPSS rescore
  23. 2026-09-17 19:50 UTCOSV refresh
  24. 2026-09-16 14:06 UTCEPSS rescore
  25. 2026-09-16 05:11 UTCEPSS rescore
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  8. 2026-09-06 13:46 UTCEPSS rescore
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  17. 2026-08-29 20:13 UTCOSV refresh
  18. 2026-08-28 21:39 UTCEPSS rescore
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  26. 2026-08-19 17:02 UTCEPSS rescore
  27. 2026-08-18 13:46 UTCEPSS rescore
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  30. 2026-08-15 01:28 UTCEPSS rescore
  31. 2026-08-13 21:58 UTCEPSS rescore
  32. 2026-08-13 07:02 UTCOSV refresh
  33. 2026-08-12 13:49 UTCEPSS rescore
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  35. 2026-08-10 23:58 UTCEPSS rescore
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  37. 2026-08-08 16:35 UTCEPSS rescore
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  39. 2026-08-06 13:45 UTCEPSS rescore
  40. 2026-08-05 19:15 UTCEPSS rescore
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  42. 2026-08-04 10:36 UTCEPSS rescore
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  44. 2026-08-02 02:25 UTCEPSS rescore
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  46. 2026-08-01 04:14 UTCEPSS rescore
  47. 2026-07-30 16:26 UTCEPSS rescore
  48. 2026-07-30 01:29 UTCEPSS rescore
  49. 2026-07-28 15:34 UTCEPSS rescore
  50. 2026-07-28 15:34 UTCEPSS rescore
  51. 2026-07-28 15:20 UTCOSV refresh
  52. 2026-07-26 14:53 UTCEPSS rescore
  53. 2026-07-25 14:16 UTCEPSS rescore
  54. 2026-07-24 14:16 UTCEPSS rescore
  55. 2026-07-23 14:16 UTCEPSS rescore
  56. 2026-07-23 02:30 UTCEG score recompute
  57. 2026-07-22 23:17 UTCEG score recompute
  58. 2026-07-22 14:07 UTCEPSS rescore
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  74. 2026-07-13 06:11 UTCEPSS rescore
  75. 2026-07-12 05:45 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-6544?
CVE-2023-6544 is a medium vulnerability published on April 25, 2024. A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic…
When was CVE-2023-6544 disclosed?
CVE-2023-6544 was first published on April 25, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-6544 actively exploited?
CVE-2023-6544 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (63rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-6544?
CVE-2023-6544 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2023-6544?
A fix for CVE-2023-6544 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-6544 are linked in the Vendor Advisories panel on this page.

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