{"id":"CVE-2020-11501","aliases":["ALPINE-CVE-2020-11501","BELL-CVE-2020-11501","DEBIAN-CVE-2020-11501","DSA-4652-1","EUVD-2020-3854","GHSA-j883-wjrw-g444","MGASA-2020-0168","RHSA-2020:1998","SUSE-SU-2020:0948-1","SUSE-SU-2020:0948-2","UBUNTU-CVE-2020-11501","openSUSE-SU-2020:0501-1"],"status":"published","title":"GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is...","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.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.03388,"percentile":0.88904,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-327","CWE-330"],"published":"2020-04-03T12:42:28Z","modified":"2026-10-26T12:00:19Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"gnutls","fixed_in":["3.6.8-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"gnutls","fixed_in":["3.6.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"gnutls","fixed_in":["3.6.7-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"gnutls","fixed_in":["3.6.7-r1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"gnutls28","fixed_in":["3.6.13-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"gnutls28","fixed_in":["3.6.13-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"gnutls28","fixed_in":["3.6.13-2"],"sources":["osv"]},{"ecosystem":"Debian:10","package":"gnutls28","fixed_in":["3.6.7-4+deb10u3"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"gnutls","fixed_in":["3.6.7-1.1.mga7"],"sources":["osv"]},{"ecosystem":"Red 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Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11501","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7"},{"url":"https://security.netapp.com/advisory/ntap-20200416-0002"},{"url":"https://usn.ubuntu.com/4322-1"},{"url":"https://github.com/advisories/GHSA-j883-wjrw-g444"},{"url":"https://security.alpinelinux.org/vuln/CVE-2020-11501","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2020-11501","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-11501","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2020-0168.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=26444","tags":["report"]},{"url":"https://access.redhat.com/errata/RHSA-2020:1998","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1821896","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_1998.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2020-11501","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-11501","tags":["advisory","report"]},{"url":"https://www.redhat.com/en/blog/understanding-dtls-all-zero-clienthellorandom-vulnerability","tags":["article"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20200948-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1152692","tags":["report"]},{"url":"https://bugzilla.suse.com/1155327","tags":["report"]},{"url":"https://bugzilla.suse.com/1166881","tags":["report"]},{"url":"https://bugzilla.suse.com/1168345","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11501","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20200948-2/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-11501","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4322-1","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/77K4ZRRLY5AFFKTFNJ3G4BEYUWA7X2P6/","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2020-11501","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.","status":"published","published":"2020-04-03T12:42:28Z","modified":"2026-10-14T08:55:12.97Z","updated_at":"2026-11-02T14:35:57.352161Z"}],"euvd":[{"id":"EUVD-2020-3854","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.","status":"published","published":"2020-04-03T12:42:28Z","modified":"2026-10-14T08:55:12Z","updated_at":"2026-11-02T17:27:17.374818Z"}],"ghsa":[{"id":"GHSA-j883-wjrw-g444","title":"GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is...","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.","status":"published","published":"2022-05-24T17:13:21Z","modified":"2026-10-14T09:31:28Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-327","CWE-330"],"updated_at":"2026-11-02T15:13:22.867821Z"}],"nvd":[{"id":"CVE-2020-11501","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.","status":"published","published":"2020-04-03T13:15:13.17Z","modified":"2026-10-14T09:17:17.877Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:05:57.678762Z"}],"osv":[{"id":"ALPINE-CVE-2020-11501","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.","status":"published","published":"2020-04-03T13:15:13.17Z","modified":"2026-10-26T11:17:55.099670551Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:27:48.11886Z"},{"id":"BELL-CVE-2020-11501","title":"CVE-2020-11501 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:16.755448Z","modified":"2026-01-26T09:48:48.245391Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:15.340685Z"},{"id":"CVE-2020-11501","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.","status":"published","published":"2020-04-03T13:15:13.17Z","modified":"2026-10-24T10:49:56.266862275Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:14.034736Z"},{"id":"DEBIAN-CVE-2020-11501","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.","status":"published","published":"2020-04-03T13:15:13.17Z","modified":"2026-10-26T12:00:19.710474757Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:32.862554Z"},{"id":"RHSA-2020:1998","title":"Red Hat Security Advisory: gnutls security update","status":"published","published":"2024-09-16T04:05:40Z","modified":"2026-10-15T10:01:36Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"UBUNTU-CVE-2020-11501","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.","status":"withdrawn","published":"2020-04-03T13:15:00Z","modified":"2026-02-04T03:30:37.378939Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:22.212782Z"},{"id":"DSA-4652-1","title":"gnutls28 - security update","status":"published","published":"2020-04-04T00:00:00Z","modified":"2026-03-09T02:10:37.199399Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2020-0168","title":"Updated gnutls packages fix security vulnerability","description":"Updated gnutls packages fix security vulnerability:\n\nA flaw was reported in the DTLS protocol implementation in GnuTLS. The\nDTLS client would not contribute any randomness to the DTLS negotiation,\nbreaking the security guarantees of the DTLS protocol (CVE-2020-11501).\n","status":"published","published":"2020-04-15T10:12:14Z","modified":"2026-04-16T04:41:14.723814253Z","updated_at":"2026-11-02T15:49:41.151324Z"},{"id":"openSUSE-SU-2020:0501-1","title":"Security update for gmp, gnutls, libnettle","description":"This update for gmp, gnutls, libnettle fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2020-11501: Fixed zero random value in DTLS client hello (bsc#1168345)\n\nFIPS related bugfixes:\n\n- FIPS: Install checksums for binary integrity verification which are\n  required when running in FIPS mode (bsc#1152692, jsc#SLE-9518)\n- FIPS: Fixed a cfb8 decryption issue, no longer truncate output IV if\n  input is shorter than block size. (bsc#1166881)\n- FIPS: Added Diffie Hellman public key verification test. (bsc#1155327)\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-04-11T12:16:14Z","modified":"2026-02-04T04:32:26.266116Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"SUSE-SU-2020:0948-1","title":"Security update for gmp, gnutls, libnettle","description":"This update for gmp, gnutls, libnettle fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2020-11501: Fixed zero random value in DTLS client hello (bsc#1168345)\n\nFIPS related bugfixes:\n\n- FIPS: Install checksums for binary integrity verification which are\n  required when running in FIPS mode (bsc#1152692, jsc#SLE-9518)\n- FIPS: Fixed a cfb8 decryption issue, no longer truncate output IV if\n  input is shorter than block size. (bsc#1166881)\n- FIPS: Added Diffie Hellman public key verification test. (bsc#1155327)\n","status":"published","published":"2020-04-08T05:44:50Z","modified":"2026-02-04T03:44:49.722034Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"SUSE-SU-2020:0948-2","title":"Security update for gmp, gnutls, libnettle","description":"This update for gmp, gnutls, libnettle fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2020-11501: Fixed zero random value in DTLS client hello (bsc#1168345)\n\nFIPS related bugfixes:\n\n- FIPS: Install checksums for binary integrity verification which are\n  required when running in FIPS mode (bsc#1152692, jsc#SLE-9518)\n- FIPS: Fixed a cfb8 decryption issue, no longer truncate output IV if\n  input is shorter than block size. (bsc#1166881)\n- FIPS: Added Diffie Hellman public key verification test. (bsc#1155327)\n","status":"published","published":"2022-07-13T16:17:58Z","modified":"2026-02-04T03:38:25.519739Z","updated_at":"2026-11-02T15:53:47.634847Z"}]}}