How severe is CVE-2023-6544?

CVE-2023-6544 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-6544 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-6544?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-6544 have an EU (EUVD) identifier?

Yes. CVE-2023-6544 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1087.

When was CVE-2023-6544 published?

CVE-2023-6544 was published on 2024-04-25 and last updated on 2026-06-17.

CVE-2023-6544

CVE-2023-6544 is a medium-severity vulnerability with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-625.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-1087
Weakness: CWE-625
Published: 2024-04-25
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-6544?: 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.
How severe is CVE-2023-6544?: CVE-2023-6544 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-6544 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-6544?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-6544 have an EU (EUVD) identifier?: Yes. CVE-2023-6544 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1087.
When was CVE-2023-6544 published?: CVE-2023-6544 was published on 2024-04-25 and last updated on 2026-06-17.

References

Other CWE-625 vulnerabilities

CVE-2026-32973 — Critical (CVSS 9.8): OpenClaw before 2026.3.11 contains an exec allowlist bypass vulnerability where matchesExecAllowlistPattern improperly…
CVE-2018-8926 — High (CVSS 8.8): Permissive regular expression vulnerability in synophoto_dsm_user in Synology Photo Station before 6.8.5-3471 and…
CVE-2026-23651 — Medium (CVSS 6.7): Permissive regular expression in Azure Compute Gallery allows an authorized attacker to elevate privileges locally.
CVE-2020-8910 — Medium (CVSS 6.5): A URL parsing issue in goog.uri of the Google Closure Library versions up to and including v20200224 allows an attacker…
CVE-2026-34830 — Medium (CVSS 5.9): Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path…
CVE-2026-34763 — Medium (CVSS 5.3): Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates…

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