CVE-2023-6544

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 1.3%, top 20% of all CVEs by exploit prediction. 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
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.4Exploit: NoneExposed: 0

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
5.4(medium)
EPSS
61.0%
KEV
Not listed

Published

April 25, 2024

Last Modified

April 15, 2026

References (18)

Patch Availability(7)

Vendor / EcosystemFixed in / 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 rangeFixed inDependents
org.keycloak:keycloak-services23.0.0 ... 24.0.2 (11 versions)24.0.3—

Weakness Classification(1)

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

All Vendor Advisories

(7)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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.

  1. 2026-07-11 08:26 UTCEPSS rescore
  2. 2026-07-09 19:08 UTCEPSS rescore
  3. 2026-07-08 15:13 UTCEPSS rescore
  4. 2026-07-07 13:45 UTCEPSS rescore
  5. 2026-07-07 13:44 UTCEPSS rescore
  6. 2026-07-06 16:26 UTCEPSS rescore
  7. 2026-07-06 16:26 UTCEPSS rescore
  8. 2026-07-06 02:22 UTCEPSS rescore
  9. 2026-07-06 02:22 UTCEPSS rescore
  10. 2026-07-05 02:29 UTCEPSS rescore
  11. 2026-07-04 06:29 UTCEPSS rescore
  12. 2026-07-01 15:05 UTCEPSS rescore
  13. 2026-06-30 23:21 UTCEPSS rescore
  14. 2026-06-30 23:21 UTCEPSS rescore
  15. 2026-06-28 04:55 UTCEPSS rescore
  16. 2026-06-27 03:07 UTCEPSS rescore
  17. 2026-06-25 13:48 UTCEPSS rescore
  18. 2026-06-25 13:48 UTCEPSS rescore
  19. 2026-06-24 14:04 UTCEPSS rescore
  20. 2026-06-24 14:04 UTCEPSS rescore
  21. 2026-06-23 21:31 UTCEPSS rescore
  22. 2026-06-23 21:31 UTCEPSS rescore
  23. 2026-06-22 14:24 UTCEPSS rescore
  24. 2026-06-22 14:24 UTCEPSS rescore
  25. 2026-06-21 14:55 UTCEPSS rescore
Show 66 more
  1. 2026-06-21 14:55 UTCEPSS rescore
  2. 2026-06-21 01:58 UTCEPSS rescore
  3. 2026-06-21 01:58 UTCEPSS rescore
  4. 2026-06-19 19:24 UTCEPSS rescore
  5. 2026-06-19 19:24 UTCEPSS rescore
  6. 2026-06-18 17:51 UTCEPSS rescore
  7. 2026-06-17 17:51 UTCEPSS rescore
  8. 2026-06-16 17:51 UTCEPSS rescore
  9. 2026-06-16 17:51 UTCEPSS rescore
  10. 2026-06-15 17:47 UTCEPSS rescore
  11. 2026-06-14 23:16 UTCEPSS rescore
  12. 2026-06-13 22:59 UTCEPSS rescore
  13. 2026-06-13 22:59 UTCEPSS rescore
  14. 2026-06-12 23:11 UTCEPSS rescore
  15. 2026-06-11 13:59 UTCEPSS rescore
  16. 2026-06-10 22:17 UTCEPSS rescore
  17. 2026-06-10 13:21 UTCEPSS rescore
  18. 2026-06-08 14:16 UTCEPSS rescore
  19. 2026-06-08 14:16 UTCEPSS rescore
  20. 2026-06-07 15:24 UTCEPSS rescore
  21. 2026-06-07 15:24 UTCEPSS rescore
  22. 2026-06-06 13:46 UTCEPSS rescore
  23. 2026-06-06 13:46 UTCEPSS rescore
  24. 2026-06-05 22:46 UTCEPSS rescore
  25. 2026-06-05 22:46 UTCEPSS rescore
  26. 2026-06-05 06:09 UTCEPSS rescore
  27. 2026-06-05 06:09 UTCEPSS rescore
  28. 2026-06-04 13:11 UTCEPSS rescore
  29. 2026-06-04 13:11 UTCEPSS rescore
  30. 2026-06-02 20:12 UTCEPSS rescore
  31. 2026-06-02 20:12 UTCEPSS rescore
  32. 2026-06-01 13:51 UTCEPSS rescore
  33. 2026-05-31 22:30 UTCEPSS rescore
  34. 2026-05-31 22:30 UTCEPSS rescore
  35. 2026-05-31 00:15 UTCEPSS rescore
  36. 2026-05-31 00:15 UTCEPSS rescore
  37. 2026-05-29 13:43 UTCEPSS rescore
  38. 2026-05-28 13:44 UTCEPSS rescore
  39. 2026-05-28 13:44 UTCEPSS rescore
  40. 2026-05-27 13:40 UTCEPSS rescore
  41. 2026-05-27 13:39 UTCEPSS rescore
  42. 2026-05-26 13:43 UTCEPSS rescore
  43. 2026-05-26 13:43 UTCEPSS rescore
  44. 2026-05-26 07:18 UTCEPSS rescore
  45. 2026-05-26 07:18 UTCEPSS rescore
  46. 2026-05-23 00:10 UTCEG score recompute
  47. 2026-05-22 21:16 UTCEPSS rescore
  48. 2026-05-22 21:16 UTCEPSS rescore
  49. 2026-05-22 21:16 UTCEPSS rescore
  50. 2026-05-22 21:16 UTCEPSS rescore
  51. 2026-05-22 21:16 UTCEPSS rescore
  52. 2026-05-22 02:45 UTCEG score recompute
  53. 2026-05-22 02:45 UTCVendor advisory
  54. 2026-05-20 22:37 UTCEPSS rescore
  55. 2026-05-20 22:37 UTCEPSS rescore
  56. 2026-05-20 22:37 UTCEPSS rescore
  57. 2026-05-20 22:37 UTCEPSS rescore
  58. 2026-05-20 11:21 UTCEPSS rescore
  59. 2026-05-20 11:21 UTCEPSS rescore
  60. 2026-05-20 11:21 UTCEPSS rescore
  61. 2026-05-20 11:21 UTCEPSS rescore
  62. 2026-05-20 11:21 UTCEPSS rescore
  63. 2026-05-18 21:30 UTCEPSS rescore
  64. 2026-05-18 21:30 UTCEPSS rescore
  65. 2026-05-18 21:30 UTCEPSS rescore
  66. 2026-05-18 21:30 UTCEPSS rescore

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 in the National Vulnerability Database 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 61.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6544, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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