CVE-2025-11419 (GCVE-0-2025-11419)
Vulnerability from cvelistv5 – Published: 2025-12-23 20:42 – Updated: 2026-04-20 17:45
VLAI
EPSS
VEX
Title
Keycloak: keycloak tls client-initiated renegotiation denial of service
Summary
A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-23 20:51 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2025:18254 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2025:18255 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2025:18889 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2025:18890 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2025-11419 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2402142 | issue-trackingx_refsource_REDHAT |
| https://github.com/keycloak/keycloak/discussions/25209 | |
| https://github.com/keycloak/keycloak/issues/43020 |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
|
Affected:
0 , < 26.0.16
(semver)
Unknown: 26.1.0 , < 26.1.* (semver) Affected: 26.2.0 , < 26.2.10 (semver) Unknown: 26.3.0 , < 26.3.* (semver) Affected: 26.4.0 , < 26.4.1 (semver) |
|||
| Red Hat | Red Hat build of Keycloak 26.0 |
Unaffected:
26.0.16-2 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.0::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.0 |
Unaffected:
26.0-20 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.0::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.0 |
Unaffected:
26.0-21 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.0::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.0.16 |
cpe:/a:redhat:build_keycloak:26.0
|
|
| Red Hat | Red Hat build of Keycloak 26.2 |
Unaffected:
26.2.10-2 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.2::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.2 |
Unaffected:
26.2-11 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.2::el9 |
|
| Red Hat | Red Hat build of Keycloak 26.2.10 |
cpe:/a:redhat:build_keycloak:26.2::el9
|
Date Public
2025-10-07 00:00
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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