{"cve":{"cve_id":"CVE-2020-13777","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":0.22284,"epss_percentile":0.97656,"epss_as_of":"2026-10-15","description":"GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.","published_at":"2020-06-04T07:01:07Z","last_modified_at":"2026-10-14T10:17:29.130000Z","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-327"],"nvd_references":["https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03","https://www.debian.org/security/2020/dsa-4697","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/","https://security.gentoo.org/glsa/202006-01","https://usn.ubuntu.com/4384-1/","http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/","https://security.netapp.com/advisory/ntap-20200619-0004/"],"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":"2026-10-15T05:10:19.374423Z"},"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":"canonical","vendor_name":"Canonical","product_slug":"ubuntu-linux","product_name":"Ubuntu Linux","version_start":"20.04","version_start_inclusive":true,"version_end":"20.04","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"},{"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":"3.6.0","version_start_inclusive":true,"version_end":"3.6.14","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03","source_type":"MISC","tags":[]},{"url":"https://www.debian.org/security/2020/dsa-4697","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://security.gentoo.org/glsa/202006-01","source_type":"MISC","tags":[]},{"url":"https://usn.ubuntu.com/4384-1/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://security.netapp.com/advisory/ntap-20200619-0004/","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2020-06-04T07:01:07Z","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"}]}