{"id":"CVE-2025-9820","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-9820","generatedAt":"2026-10-28T02:11:47.046Z","title":"This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution.","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.","published":"2026-01-26T20:16:09.000Z","lastModified":"2026-10-14T20:17:27.000Z","status":"Deferred","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-121"],"affected":[],"epss":{"score":0.00222,"percentile":0.12731,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:13812","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:3477","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:4188","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:4655","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:4943","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:5585","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:5606","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:7329","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:7477","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82347","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82354","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82372","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:82857","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-9820","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2392528","source":"secalert@redhat.com"},{"url":"https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5","source":"secalert@redhat.com"},{"url":"https://gitlab.com/gnutls/gnutls/-/issues/1732","source":"secalert@redhat.com"},{"url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18","source":"secalert@redhat.com"},{"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"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-9820","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}