{"id":"CVE-2020-24659","aliases":["ALPINE-CVE-2020-24659","AZL-6445","BELL-CVE-2020-24659","DEBIAN-CVE-2020-24659","EUVD-2020-17374","GHSA-wx7m-j6j8-xm63","JLSEC-2026-519","MGASA-2020-0379","OESA-2021-1046","RHSA-2020:5483","SUSE-SU-2020:2864-1","SUSE-SU-2020:2864-2","SUSE-SU-2020:2988-1","UBUNTU-CVE-2020-24659","USN-4491-1","openSUSE-SU-2020:1724-1","openSUSE-SU-2020:1743-1"],"status":"published","title":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference...","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0383,"percentile":0.90227,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476","CWE-787"],"published":"2020-09-04T14:03:36Z","modified":"2026-10-26T12:00:39Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"gnutls","fixed_in":["3.6.15-r0"],"sources":["osv"]},{"ecosystem":"Azure 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issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T14:03:36Z","modified":"2026-10-14T09:35:20.961Z","updated_at":"2026-11-02T14:35:54.468882Z"}],"euvd":[{"id":"EUVD-2020-17374","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T14:03:36Z","modified":"2026-10-14T09:35:20Z","updated_at":"2026-11-02T17:27:16.85534Z"}],"ghsa":[{"id":"GHSA-wx7m-j6j8-xm63","title":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference...","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2022-05-24T17:27:24Z","modified":"2026-10-14T12:32:22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476","CWE-787"],"updated_at":"2026-11-02T15:13:24.188405Z"}],"nvd":[{"id":"CVE-2020-24659","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T15:15:10.803Z","modified":"2026-10-14T10:17:32.493Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476","CWE-787"],"updated_at":"2026-11-02T14:06:14.981587Z"}],"osv":[{"id":"ALPINE-CVE-2020-24659","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T15:15:10.803Z","modified":"2026-10-26T11:17:55.150572608Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:48.11886Z"},{"id":"AZL-6445","title":"CVE-2020-24659 affecting package gnutls for versions less than 3.6.14-5","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T15:15:10Z","modified":"2026-04-21T04:32:25.252642Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"BELL-CVE-2020-24659","title":"CVE-2020-24659 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:29.661473Z","modified":"2026-01-26T09:46:15.164468Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2020-24659","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T15:15:10.803Z","modified":"2026-10-24T10:50:01.578281272Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:15.879068Z"},{"id":"DEBIAN-CVE-2020-24659","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T15:15:10.803Z","modified":"2026-10-26T12:00:39.814078782Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:33.729655Z"},{"id":"JLSEC-2026-519","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a `no_renegotiation` alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the `gnutls_deinit` function is called after detecting a handshake failure.","status":"published","published":"2026-05-26T14:17:50.003Z","modified":"2026-07-25T18:24:33.634761481Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:47:18.573531Z"},{"id":"OESA-2021-1046","title":"gnutls security update","description":"GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures.\r\n\r\nSecurity Fix(es):\r\n\r\nAn issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.(CVE-2020-24659)","status":"published","published":"2021-03-05T11:04:16Z","modified":"2026-08-18T01:15:13.977664885Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2020:5483","title":"Red Hat Security Advisory: gnutls security and bug fix update","status":"published","published":"2024-09-16T05:11:01Z","modified":"2026-10-15T10:01:42Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"UBUNTU-CVE-2020-24659","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.","status":"published","published":"2020-09-04T15:15:00Z","modified":"2026-04-22T12:34:53.07962Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:23.905183Z"},{"id":"MGASA-2020-0379","title":"Updated gnutls packages fix security vulnerability","description":"An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL\npointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent\nwith unexpected timing, and then an invalid second handshake occurs. The crash\nhappens in the application's error handling path, where the gnutls_deinit\nfunction is called after detecting a handshake failure (CVE-2020-24659).\n","status":"published","published":"2020-09-30T10:01:40Z","modified":"2026-04-16T04:43:33.718860721Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2020:1724-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)\n- FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)\n- FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)\n- FIPS: Add TLS KDF selftest (bsc#1176671)\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-10-24T22:22:04Z","modified":"2025-05-07T18:11:51.583449Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"openSUSE-SU-2020:1743-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)\n- FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)\n- FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)\n- FIPS: Add TLS KDF selftest (bsc#1176671)\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-10-26T09:22:14Z","modified":"2026-02-04T03:07:07.237941Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"SUSE-SU-2020:2864-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)\n- FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)\n- FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)\n- FIPS: Add TLS KDF selftest (bsc#1176671)\n","status":"published","published":"2020-10-06T08:34:18Z","modified":"2025-05-02T04:10:03.625797Z","updated_at":"2026-11-02T15:53:48.11786Z"},{"id":"SUSE-SU-2020:2864-2","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)\n- FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)\n- FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)\n- FIPS: Add TLS KDF selftest (bsc#1176671)\n","status":"published","published":"2022-07-14T15:14:36Z","modified":"2026-02-04T04:09:46.405133Z","updated_at":"2026-11-02T15:53:48.11786Z"},{"id":"SUSE-SU-2020:2988-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)\n- FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)\n- FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)\n- FIPS: Add TLS KDF selftest (bsc#1176671)\n","status":"published","published":"2020-10-21T15:35:55Z","modified":"2026-02-04T03:34:05.886579Z","updated_at":"2026-11-02T15:53:48.11786Z"},{"id":"USN-4491-1","title":"gnutls28 vulnerability","description":"It was discovered that GnuTLS incorrectly handled certain alerts when being\nused with TLS 1.3 servers. A remote attacker could use this issue to cause\nGnuTLS to crash, resulting in a denial of service, or possibly execute\narbitrary code.\n","status":"published","published":"2020-09-09T11:04:03Z","modified":"2026-04-22T10:07:50.068217Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}