CVE-2025-11419
Full vulnerability record from the local CVENow database.
Description
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
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2025-12-23 21:15:46.557000
Last modified
2026-10-19 22:10:00.130000
View original CVE JSON
{
"id": "CVE-2025-11419",
"sourceIdentifier": "[email protected]",
"published": "2025-12-23T21:15:46.557",
"lastModified": "2026-10-19T22:10:00.130",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Se encontró una falla en Keycloak. Esta vulnerabilidad permite a un atacante remoto no autenticado provocar una denegación de servicio (DoS) al iniciar repetidamente solicitudes de renegociación iniciadas por el cliente TLS?1.2, lo que agota los recursos de CPU del servidor y deja el servicio indisponible."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"defaultStatus": "unaffected",
"collectionURL": "https://github.com/keycloak/keycloak/",
"packageName": "keycloak",
"versions": [
{
"version": "0",
"lessThan": "26.0.16",
"versionType": "semver",
"status": "affected"
},
{
"version": "26.1.0",
"lessThan": "26.1.*",
"versionType": "semver",
"status": "unknown"
},
{
"version": "26.2.0",
"lessThan": "26.2.10",
"versionType": "semver",
"status": "affected"
},
{
"version": "26.3.0",
"lessThan": "26.3.*",
"versionType": "semver",
"status": "unknown"
},
{
"version": "26.4.0",
"lessThan": "26.4.1",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.0",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-operator-bundle",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.0::el9"
],
"versions": [
{
"version": "26.0.16-2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.0",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.0::el9"
],
"versions": [
{
"version": "26.0-20",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.0",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9-operator",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.0::el9"
],
"versions": [
{
"version": "26.0-21",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.0.16",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "keycloak-server",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.0"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.2",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-operator-bundle",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.2::el9"
],
"versions": [
{
"version": "26.2.10-2",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.2",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.2::el9"
],
"versions": [
{
"version": "26.2-11",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.2",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9-operator",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.2::el9"
],
"versions": [
{
"version": "26.2-11",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.2.10",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "keycloak-server",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.2::el9"
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2025-12-23T20:51:23.601159Z",
"id": "CVE-2025-11419",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-770"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2025:18254",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2025:18255",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2025:18889",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2025:18890",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2025-11419",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402142",
"source": "[email protected]"
},
{
"url": "https://github.com/keycloak/keycloak/discussions/25209",
"source": "[email protected]"
},
{
"url": "https://github.com/keycloak/keycloak/issues/43020",
"source": "[email protected]"
}
]
}