CVE-2020-1967 (GCVE-0-2020-1967)

Vulnerability from cvelistv5 – Published: 2020-04-21 13:45 – Updated: 2026-10-08 21:03
VLAI
Title
Segmentation fault in SSL_check_chain
Summary
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).
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 20:59 UTC
CWE
  • NULL pointer dereference
Assigner
openssl CNA under the mitre root
CNA scorecard B 78/100 over 43 records in the last 180 days details
References
URL Tags
https://security.FreeBSD.org/advisories/FreeBSD-S… vendor-advisoryx_refsource_FREEBSD
https://www.debian.org/security/2020/dsa-4661 vendor-advisoryx_refsource_DEBIAN
http://www.openwall.com/lists/oss-security/2020/04/22/2 mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9a41e304992… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r66ea9c436da… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r94d6ac3f010… mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202004-10 vendor-advisoryx_refsource_GENTOO
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://seclists.org/fulldisclosure/2020/May/5 mailing-listx_refsource_FULLDISC
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://www.oracle.com/security-alerts/cpujul2020.html x_refsource_MISC
https://www.tenable.com/security/tns-2020-03 x_refsource_CONFIRM
https://www.openssl.org/news/secadv/20200421.txt x_refsource_CONFIRM
https://git.openssl.org/gitweb/?p=openssl.git%3Ba… x_refsource_CONFIRM
https://kb.pulsesecure.net/articles/Pulse_Securit… x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2020042… x_refsource_CONFIRM
https://www.synology.com/security/advisory/Synolo… x_refsource_CONFIRM
https://github.com/irsl/CVE-2020-1967 x_refsource_MISC
http://packetstormsecurity.com/files/157527/OpenS… x_refsource_MISC
https://www.synology.com/security/advisory/Synolo… x_refsource_CONFIRM
https://www.tenable.com/security/tns-2020-04 x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020071… x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
https://www.tenable.com/security/tns-2020-11 x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
https://www.tenable.com/security/tns-2021-10 x_refsource_CONFIRM
https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f)
guessed Create a notification for this product.
Date Public
2020-04-21 00:00
Credits
Bernd Edlinger
Show details on NVD website
To clipboard 

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            "value": "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)."
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          {
            "lang": "es",
            "value": "Las aplicaciones de Servidor o Cliente que llaman a la funci\u00f3n SSL_check_chain() durante o despu\u00e9s del protocolo de enlace de TLS versi\u00f3n 1.3,  puede bloquear debido a una desreferencia del puntero NULL como resultado de un manejo incorrecto de la extensi\u00f3n TLS \"signature_algorithms_cert\". El bloqueo ocurre si se recibe un algoritmo de firma no comprobada o ni reconocido del peer. Esto podr\u00eda ser explotado por un peer malicioso en un ataque de Denegaci\u00f3n de Servicio. OpenSSL versiones 1.1.1d, 1.1.1e y 1.1.1f est\u00e1n afectadas por este problema. Este problema no afectaba a OpenSSL versiones anteriores a la versi\u00f3n  1.1.1d. Corregido en OpenSSL versi\u00f3n 1.1.1g (Afectado en la versi\u00f3n 1.1.1d-1.1.1f)."
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                "baseScore": 5.0,
                "confidentialityImpact": "NONE",
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                "version": "2.0"
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              "obtainAllPrivilege": false,
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              "obtainUserPrivilege": false,
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                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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                "role": "CISA Coordinator",
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                "lang": "eng",
                "value": "Bernd Edlinger"
              }
            ],
            "data_format": "MITRE",
            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "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)."
                }
              ]
            },
            "impact": [
              {
                "lang": "eng",
                "url": "https://www.openssl.org/policies/secpolicy.html#High",
                "value": "High"
              }
            ],
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "NULL pointer dereference"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "FreeBSD-SA-20:11",
                  "refsource": "FREEBSD",
                  "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc"
                },
                {
                  "name": "DSA-4661",
                  "refsource": "DEBIAN",
                  "url": "https://www.debian.org/security/2020/dsa-4661"
                },
                {
                  "name": "[oss-security] 20200422 [CVE-2020-1967] OpenSSL 1.1.1d+ Segmentation fault in SSL_check_chain",
                  "refsource": "MLIST",
                  "url": "http://www.openwall.com/lists/oss-security/2020/04/22/2"
                },
                {
                  "name": "[tomcat-dev] 20200422 Time for Tomcat Native 1.2.24?",
                  "refsource": "MLIST",
                  "url": "https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee@%3Cdev.tomcat.apache.org%3E"
                },
                {
                  "name": "[tomcat-dev] 20200422 Re: Time for Tomcat Native 1.2.24?",
                  "refsource": "MLIST",
                  "url": "https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345@%3Cdev.tomcat.apache.org%3E"
                },
                {
                  "name": "[tomcat-dev] 20200423 Re: Time for Tomcat Native 1.2.24?",
                  "refsource": "MLIST",
                  "url": "https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064@%3Cdev.tomcat.apache.org%3E"
                },
                {
                  "name": "GLSA-202004-10",
                  "refsource": "GENTOO",
                  "url": "https://security.gentoo.org/glsa/202004-10"
                },
                {
                  "name": "FEDORA-2020-fcc91a28e8",
                  "refsource": "FEDORA",
                  "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/"
                },
                {
                  "name": "FEDORA-2020-da2d1ef2d7",
                  "refsource": "FEDORA",
                  "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/"
                },
                {
                  "name": "20200501 CVE-2020-1967: proving sigalg != NULL",
                  "refsource": "FULLDISC",
                  "url": "http://seclists.org/fulldisclosure/2020/May/5"
                },
                {
                  "name": "FEDORA-2020-d7b29838f6",
                  "refsource": "FEDORA",
                  "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/"
                },
                {
                  "name": "openSUSE-SU-2020:0933",
                  "refsource": "SUSE",
                  "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html"
                },
                {
                  "name": "openSUSE-SU-2020:0945",
                  "refsource": "SUSE",
                  "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html"
                },
                {
                  "name": "https://www.oracle.com/security-alerts/cpujul2020.html",
                  "refsource": "MISC",
                  "url": "https://www.oracle.com/security-alerts/cpujul2020.html"
                },
                {
                  "name": "https://www.tenable.com/security/tns-2020-03",
                  "refsource": "CONFIRM",
                  "url": "https://www.tenable.com/security/tns-2020-03"
                },
                {
                  "name": "https://www.openssl.org/news/secadv/20200421.txt",
                  "refsource": "CONFIRM",
                  "url": "https://www.openssl.org/news/secadv/20200421.txt"
                },
                {
                  "name": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=eb563247aef3e83dda7679c43f9649270462e5b1",
                  "refsource": "CONFIRM",
                  "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=eb563247aef3e83dda7679c43f9649270462e5b1"
                },
                {
                  "name": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440",
                  "refsource": "CONFIRM",
                  "url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440"
                },
                {
                  "name": "https://security.netapp.com/advisory/ntap-20200424-0003/",
                  "refsource": "CONFIRM",
                  "url": "https://security.netapp.com/advisory/ntap-20200424-0003/"
                },
                {
                  "name": "https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL",
                  "refsource": "CONFIRM",
                  "url": "https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL"
                },
                {
                  "name": "https://github.com/irsl/CVE-2020-1967",
                  "refsource": "MISC",
                  "url": "https://github.com/irsl/CVE-2020-1967"
                },
                {
                  "name": "http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html",
                  "refsource": "MISC",
                  "url": "http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html"
                },
                {
                  "name": "https://www.synology.com/security/advisory/Synology_SA_20_05",
                  "refsource": "CONFIRM",
                  "url": "https://www.synology.com/security/advisory/Synology_SA_20_05"
                },
                {
                  "name": "https://www.tenable.com/security/tns-2020-04",
                  "refsource": "CONFIRM",
                  "url": "https://www.tenable.com/security/tns-2020-04"
                },
                {
                  "name": "https://www.oracle.com/security-alerts/cpuoct2020.html",
                  "refsource": "MISC",
                  "url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
                },
                {
                  "name": "https://security.netapp.com/advisory/ntap-20200717-0004/",
                  "refsource": "CONFIRM",
                  "url": "https://security.netapp.com/advisory/ntap-20200717-0004/"
                },
                {
                  "name": "https://www.oracle.com/security-alerts/cpujan2021.html",
                  "refsource": "MISC",
                  "url": "https://www.oracle.com/security-alerts/cpujan2021.html"
                },
                {
                  "name": "https://www.tenable.com/security/tns-2020-11",
                  "refsource": "CONFIRM",
                  "url": "https://www.tenable.com/security/tns-2020-11"
                },
                {
                  "name": "https://www.oracle.com/security-alerts/cpuApr2021.html",
                  "refsource": "MISC",
                  "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
                },
                {
                  "name": "https://www.tenable.com/security/tns-2021-10",
                  "refsource": "CONFIRM",
                  "url": "https://www.tenable.com/security/tns-2021-10"
                },
                {
                  "name": "https://www.oracle.com//security-alerts/cpujul2021.html",
                  "refsource": "MISC",
                  "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
                },
                {
                  "name": "https://www.oracle.com/security-alerts/cpuoct2021.html",
                  "refsource": "MISC",
                  "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
                }
              ]
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "assignerShortName": "openssl",
        "cveId": "CVE-2020-1967",
        "datePublished": "2020-04-21T13:45:15.136Z",
        "dateReserved": "2019-12-03T00:00:00.000Z",
        "dateUpdated": "2026-10-08T21:03:24.490Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.