CVE-2020-1967

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

53.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 98.8% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-08.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-04-21 13:45Z6 YR AGO

Last updated

2026-10-08 21:03Z20 DAYS AGO

Reserved

2019-12-03

Assigning CNA

openssl

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

c139f6b96344c58138444392fedc142dbb85fa0725449e6420140d4d3ab7c168

• security.freebsd.orgFreeBSD-SA-20:11https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.ascvendor-advisoryx_refsource_FREEBSD
• www.debian.orgDSA-4661https://www.debian.org/security/2020/dsa-4661vendor-advisoryx_refsource_DEBIAN
• www.openwall.com[oss-security] 20200422 [CVE-2020-1967] OpenSSL 1.1.1d+ Segmentation fault in SSL_check_chainhttp://www.openwall.com/lists/oss-security/2020/04/22/2mailing-listx_refsource_MLIST
• lists.apache.org[tomcat-dev] 20200422 Time for Tomcat Native 1.2.24?https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-dev] 20200422 Re: Time for Tomcat Native 1.2.24?https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-dev] 20200423 Re: Time for Tomcat Native 1.2.24?https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202004-10https://security.gentoo.org/glsa/202004-10vendor-advisoryx_refsource_GENTOO
• lists.fedoraproject.orgFEDORA-2020-fcc91a28e8https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2020-da2d1ef2d7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/vendor-advisoryx_refsource_FEDORA
• seclists.org20200501 CVE-2020-1967: proving sigalg != NULLhttp://seclists.org/fulldisclosure/2020/May/5mailing-listx_refsource_FULLDISC
• lists.fedoraproject.orgFEDORA-2020-d7b29838f6https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/vendor-advisoryx_refsource_FEDORA
• lists.opensuse.orgopenSUSE-SU-2020:0933http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.htmlvendor-advisoryx_refsource_SUSE
• lists.opensuse.orgopenSUSE-SU-2020:0945http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.htmlvendor-advisoryx_refsource_SUSE
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2020.htmlx_refsource_MISC
• www.tenable.comhttps://www.tenable.com/security/tns-2020-03x_refsource_CONFIRM
• www.openssl.orghttps://www.openssl.org/news/secadv/20200421.txtx_refsource_CONFIRM
• git.openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1x_refsource_CONFIRM
• kb.pulsesecure.nethttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440x_refsource_CONFIRM
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20200424-0003/x_refsource_CONFIRM
• www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSLx_refsource_CONFIRM
• github.comhttps://github.com/irsl/CVE-2020-1967x_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.htmlx_refsource_MISC
• www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_20_05x_refsource_CONFIRM
• www.tenable.comhttps://www.tenable.com/security/tns-2020-04x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2020.htmlx_refsource_MISC
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20200717-0004/x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2021.htmlx_refsource_MISC
• www.tenable.comhttps://www.tenable.com/security/tns-2020-11x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuApr2021.htmlx_refsource_MISC
• www.tenable.comhttps://www.tenable.com/security/tns-2021-10x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC