{"id":"CVE-2020-1967","revision":"4bb8e6126dd34c628209bc434d2cd678","records":[{"revision":"4bb8e6126dd34c628209bc434d2cd678","observedAt":"2026-10-24T16:17:26.926+00:00","statement":{"source":"nvd","id":"CVE-2020-1967","aliases":[],"title":"Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the \"signature_algorithms_cert\" TLS extension. The c…","description":"Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the \"signature_algorithms_cert\" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).","state":0,"publishedAt":"2020-04-21T14:15:11.287+00:00","modifiedAt":"2026-10-08T21:17:24.923+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"},{"system":"CVSS 2.0 · nvd@nist.gov · Primary","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","score":5,"severity":"MEDIUM"}],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html","http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html","http://seclists.org/fulldisclosure/2020/May/5","http://www.openwall.com/lists/oss-security/2020/04/22/2","https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1","https://github.com/irsl/CVE-2020-1967","https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440","https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3E","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/","https://security.freebsd.org/advisories/FreeBSD-SA-20:11.openssl.asc","https://security.gentoo.org/glsa/202004-10","https://security.netapp.com/advisory/ntap-20200424-0003/","https://security.netapp.com/advisory/ntap-20200717-0004/","https://www.debian.org/security/2020/dsa-4661","https://www.openssl.org/news/secadv/20200421.txt","https://www.oracle.com//security-alerts/cpujul2021.html","https://www.oracle.com/security-alerts/cpuApr2021.html","https://www.oracle.com/security-alerts/cpujan2021.html","https://www.oracle.com/security-alerts/cpujul2020.html","https://www.oracle.com/security-alerts/cpuoct2020.html","https://www.oracle.com/security-alerts/cpuoct2021.html","https://www.synology.com/security/advisory/Synology_SA_20_05","https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL","https://www.tenable.com/security/tns-2020-03","https://www.tenable.com/security/tns-2020-04","https://www.tenable.com/security/tns-2020-11","https://www.tenable.com/security/tns-2021-10"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-1967","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-476"],"productCriteria":["cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:freebsd:freebsd:12.1:-:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*","cpe:2.3:a:oracle:application_server:12.1.3:*:*:*:*:*:*:*","cpe:2.3:a:oracle:enterprise_manager_base_platform:13.4.0.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.3.0.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.4.0.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:*:*:*:*:*:*:*","cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*","cpe:2.3:a:oracle:mysql_connectors:*:*:*:*:*:*:*:*","cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:*","cpe:2.3:a:oracle:mysql_workbench:*:*:*:*:*:*:*:*","cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.56:*:*:*:*:*:*:*","cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*","cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*","cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*","cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:windows:*:*","cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:vmware_vsphere:*:*","cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:*","cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*","cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*","cpe:2.3:a:netapp:smi-s_provider:-:*:*:*:*:*:*:*","cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*","cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*","cpe:2.3:o:broadcom:fabric_operating_system:-:*:*:*:*:*:*:*","cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*","cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*","cpe:2.3:a:jdedwards:enterpriseone:*:*:*:*:*:*:*:*","cpe:2.3:a:tenable:log_correlation_engine:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2020-04-21T14:15:11.287","lastModified":"2026-10-08T21:17:24.923"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2020-1967","identifiers":["CVE-2020-1967"]},"retained":false,"historicalAffected":[]}],"coverage":[]}