High 7.5Published Apr 21, 2020

CVE-2020-1967Segmentation fault in SSL_check_chain

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects OpenSSL and 25 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for OpenSSL

Exploited in the last 30 days

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).

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: openssl
NVD analysis: Modified
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OpenSSL OpenSSL openssl:openssl (from the name)	Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f)	CNA record
openssl openssl openssl:openssl	from 1.1.1d through 1.1.1f	NVD
debian debian_linux debian:debian_linux	9.0; 10.0	NVD
freebsd freebsd freebsd:freebsd	12.1	NVD
fedoraproject fedora fedoraproject:fedora	30; 31; 32	NVD
oracle application_server oracle:application_server	12.1.3	NVD
oracle enterprise_manager_base_platform oracle:enterprise_manager_base_platform	13.4.0.0	NVD
oracle enterprise_manager_for_storage_management oracle:enterprise_manager_for_storage_management	13.3.0.0; 13.4.0.0	NVD
oracle enterprise_manager_ops_center oracle:enterprise_manager_ops_center	12.4.0	NVD
oracle http_server oracle:http_server	12.2.1.4.0	NVD
oracle jd_edwards_world_security oracle:jd_edwards_world_security	a9.4	NVD
oracle mysql oracle:mysql	through 5.6.48; from 5.7.0 through 5.7.30; from 8.0.0 through 8.0.20	NVD
oracle mysql_connectors oracle:mysql_connectors	through 8.0.20	NVD
oracle mysql_enterprise_monitor oracle:mysql_enterprise_monitor	through 4.0.12; from 8.0.0 through 8.0.20	NVD
oracle mysql_workbench oracle:mysql_workbench	through 8.0.21	NVD
oracle peoplesoft_enterprise_peopletools oracle:peoplesoft_enterprise_peopletools	8.56; 8.57; 8.58; 8.59	NVD
netapp active_iq_unified_manager netapp:active_iq_unified_manager	from 7.3; from 9.5	NVD
netapp e-series_performance_analyzer netapp:e-series_performance_analyzer	all versions	NVD
netapp oncommand_insight netapp:oncommand_insight	all versions	NVD
netapp oncommand_workflow_automation netapp:oncommand_workflow_automation	all versions	NVD
netapp smi-s_provider netapp:smi-s_provider	all versions	NVD
netapp snapcenter netapp:snapcenter	all versions	NVD
netapp steelstore_cloud_integrated_storage netapp:steelstore_cloud_integrated_storage	all versions	NVD
broadcom fabric_operating_system broadcom:fabric_operating_system	all versions	NVD
opensuse leap opensuse:leap	15.1; 15.2	NVD
jdedwards enterpriseone jdedwards:enterpriseone	before 9.2.5.0	NVD
tenable log_correlation_engine tenable:log_correlation_engine	before 6.0.9	NVD

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.ascvendor-advisory, x-refsource-freebsd
https://www.debian.org/security/2020/dsa-4661vendor-advisory, x-refsource-debian
http://www.openwall.com/lists/oss-security/2020/04/22/2mailing-list, x-refsource-mlist
https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
https://security.gentoo.org/glsa/202004-10vendor-advisory, x-refsource-gentoo
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/vendor-advisory, x-refsource-fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/vendor-advisory, x-refsource-fedora
http://seclists.org/fulldisclosure/2020/May/5mailing-list, x-refsource-fulldisc
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/vendor-advisory, x-refsource-fedora
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.htmlvendor-advisory, x-refsource-suse
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.htmlvendor-advisory, x-refsource-suse
https://www.oracle.com/security-alerts/cpujul2020.htmlx-refsource-misc
https://www.tenable.com/security/tns-2020-03x-refsource-confirm
https://www.openssl.org/news/secadv/20200421.txtx-refsource-confirm
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1x-refsource-confirm
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440x-refsource-confirm
https://security.netapp.com/advisory/ntap-20200424-0003/x-refsource-confirm
https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSLx-refsource-confirm
https://github.com/irsl/CVE-2020-1967x-refsource-misc
http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.htmlx-refsource-misc
https://www.synology.com/security/advisory/Synology_SA_20_05x-refsource-confirm
https://www.tenable.com/security/tns-2020-04x-refsource-confirm
https://www.oracle.com/security-alerts/cpuoct2020.htmlx-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.