{"cve":{"cve_id":"CVE-2020-11501","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.03388,"epss_percentile":0.88613,"epss_as_of":"2026-10-15","description":"GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.","published_at":"2020-04-03T12:42:28Z","last_modified_at":"2026-10-14T09:17:17.877000Z","cvss_v3_score":7.4,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-330"],"nvd_references":["https://security.gentoo.org/glsa/202004-06","https://gitlab.com/gnutls/gnutls/-/issues/960","https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2","https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31","https://www.debian.org/security/2020/dsa-4652","http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html","https://security.netapp.com/advisory/ntap-20200416-0002/","https://usn.ubuntu.com/4322-1/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-10-15T05:10:06.628206Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"canonical","vendor_name":"Canonical","product_slug":"ubuntu-linux","product_name":"Ubuntu Linux","version_start":"19.10","version_start_inclusive":true,"version_end":"19.10","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*"},{"vendor_slug":"debian","vendor_name":"Debian","product_slug":"debian-linux","product_name":"debian_linux","version_start":"10.0","version_start_inclusive":true,"version_end":"10.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"fedora","product_name":"fedora","version_start":"31","version_start_inclusive":true,"version_end":"31","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"fedora","product_name":"fedora","version_start":"32","version_start_inclusive":true,"version_end":"32","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"},{"vendor_slug":"gnu","vendor_name":"gnu","product_slug":"gnutls","product_name":"gnutls","version_start":"3.6.3","version_start_inclusive":true,"version_end":"3.6.13","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*"},{"vendor_slug":"opensuse","vendor_name":"openSUSE","product_slug":"leap","product_name":"Leap","version_start":"15.1","version_start_inclusive":true,"version_end":"15.1","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://security.gentoo.org/glsa/202004-06","source_type":"MISC","tags":[]},{"url":"https://gitlab.com/gnutls/gnutls/-/issues/960","source_type":"MISC","tags":[]},{"url":"https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2","source_type":"MISC","tags":["patch"]},{"url":"https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31","source_type":"MISC","tags":[]},{"url":"https://www.debian.org/security/2020/dsa-4652","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://security.netapp.com/advisory/ntap-20200416-0002/","source_type":"MISC","tags":[]},{"url":"https://usn.ubuntu.com/4322-1/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/","source_type":"MAILING_LIST","tags":["mailing-list"]}],"timeline":[{"type":"published","at":"2020-04-03T12:42:28Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-10-14T23:59:09.254433Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-14T23:59:09.254433Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-14T23:59:09.254433Z","label":"CVSS score revised","source":"nvd"}]}