CVE-2025-9820
Full vulnerability record from the local CVENow database.
Description
A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.
Severity
MEDIUM
CVSS score
4.0
(v3.1)
Vulnerability status
Deferred
Source identifier
Published
2026-01-26 20:16:09.370000
Last modified
2026-11-06 18:17:30.020000
View original CVE JSON
{
"id": "CVE-2025-9820",
"sourceIdentifier": "[email protected]",
"published": "2026-01-26T20:16:09.370",
"lastModified": "2026-11-06T18:17:30.020",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks."
},
{
"lang": "es",
"value": "Se encontró una falla en la librería GnuTLS, específicamente en la función gnutls_pkcs11_token_init() que maneja la inicialización de tokens PKCS#11. Cuando se procesa una etiqueta de token más larga de lo esperado, la función escribe más allá del final de un búfer de pila de tamaño fijo. Este error de programación puede causar que la aplicación que usa GnuTLS se bloquee o, en ciertas condiciones, ser explotado para la ejecución de código. Como resultado, los sistemas o aplicaciones que dependen de GnuTLS pueden ser vulnerables a ataques de denegación de servicio o escalada de privilegios local."
}
],
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{
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"metrics": {
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{
"source": "[email protected]",
"type": "Secondary",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"baseScore": 4.0,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
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}
],
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"ssvcData": {
"timestamp": "2026-01-26T20:10:45.615719Z",
"id": "CVE-2025-9820",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
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{
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}
],
"role": "CISA Coordinator",
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},
"weaknesses": [
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"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-121"
}
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],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:13812",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:3477",
"source": "[email protected]"
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{
"url": "https://access.redhat.com/errata/RHSA-2026:4188",
"source": "[email protected]"
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{
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"source": "[email protected]"
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{
"url": "https://access.redhat.com/errata/RHSA-2026:4943",
"source": "[email protected]"
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{
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{
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"source": "[email protected]"
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{
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"source": "[email protected]"
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{
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"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:82372",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:82857",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2025-9820",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2392528",
"source": "[email protected]"
},
{
"url": "https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5",
"source": "[email protected]"
},
{
"url": "https://gitlab.com/gnutls/gnutls/-/issues/1732",
"source": "[email protected]"
},
{
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18",
"source": "[email protected]"
},
{
"url": "http://www.openwall.com/lists/oss-security/2025/11/20/2",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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]
}