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    CVE-2020-1967

    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).

    Published:Apr 21, 2020
    Last Modified:Nov 21, 2024
    EPS:Apr 21, 2020
    EPSS Score:0.67225
    CVSS Score:7.5

    Affected Products

    Vendor
    Broadcom
    Product
    Fabric Operating System
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Freebsd
    Product
    Freebsd
    Vendor
    Jdedwards
    Product
    Enterpriseone
    Vendor
    Netapp
    Product
    Active Iq Unified Manager
    Vendor
    Netapp
    Product
    E-series Performance Analyzer
    Vendor
    Netapp
    Product
    Oncommand Insight
    Vendor
    Netapp
    Product
    Oncommand Workflow Automation
    Vendor
    Netapp
    Product
    Smi-s Provider
    Vendor
    Netapp
    Product
    Snapcenter
    Vendor
    Netapp
    Product
    Steelstore Cloud Integrated Storage
    Vendor
    Openssl
    Product
    Openssl
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Oracle
    Product
    Application Server
    Vendor
    Oracle
    Product
    Enterprise Manager Base Platform
    Vendor
    Oracle
    Product
    Enterprise Manager For Storage Management
    Vendor
    Oracle
    Product
    Enterprise Manager Ops Center
    Vendor
    Oracle
    Product
    Http Server
    Vendor
    Oracle
    Product
    Jd Edwards World Security
    Vendor
    Oracle
    Product
    Mysql
    Vendor
    Oracle
    Product
    Mysql Connectors
    Vendor
    Oracle
    Product
    Mysql Enterprise Monitor
    Vendor
    Oracle
    Product
    Mysql Workbench
    Vendor
    Oracle
    Product
    Peoplesoft Enterprise Peopletools
    Vendor
    Tenable
    Product
    Log Correlation Engine

    Exploits

    https://github.com/irsl/CVE-2020-1967https://github.com/irsl/CVE-2020-1967https://github.com/irsl/CVE-2020-1967

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2025-58380 (CVSS 4.6) — A vulnerability in Brocade Fabric OS before 9.2.1 could allow an authenticated attacker with admin privileges …
    CVE-2026-0383 (CVSS 8.2) — A vulnerability in Brocade Fabric OS could allow an authenticated, local attacker with privileges to access th…
    CVE-2025-58379 (CVSS 6) — Brocade Fabric OS before 9.2.1 has a vulnerability that could allow a local authenticated attacker to reveal c…
    CVE-2025-58383 (CVSS 8.4) — A vulnerability in Brocade Fabric OS versions before 9.2.1c2 could allow an administrator-level user to execut…
    CVE-2025-58382 (CVSS 8.5) — A vulnerability in the secure configuration of authentication and management services in Brocade Fabric OS be…
    CVE-2025-4663 (CVSS 6.8) — An Improper Check for Unusual or Exceptional Conditions vulnerability in Brocade Fabric OS before 9.2.2.a co…
    CVE-2025-4661 (CVSS 4.8) — A path transversal vulnerability in Brocade Fabric OS 9.1.0 through 9.2.2 could allow a local admin user to …
    CVE-2025-1976 (CVSS 8.6) — Brocade Fabric OS versions starting with 9.1.0 have root access removed, however, a local user with admin priv…

    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
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High