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CVE-2020-1971 (GCVE-0-2020-1971)

Vulnerability from cvelistv5 – Published: 2020-12-08 15:30 – Updated: 2026-05-29 15:40
VLAI
Title
EDIPARTYNAME NULL pointer dereference
Summary
The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the "-crl_download" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-29 15:40 UTC
CWE
  • NULL pointer dereference
  • CWE-476 - NULL Pointer Dereference
Assigner
References
URL Tags
https://www.openssl.org/news/secadv/20201208.txt
https://git.openssl.org/gitweb/?p=openssl.git%3Ba…
https://git.openssl.org/gitweb/?p=openssl.git%3Ba…
https://www.debian.org/security/2020/dsa-4807 vendor-advisory
https://security.FreeBSD.org/advisories/FreeBSD-S… vendor-advisory
https://lists.debian.org/debian-lts-announce/2020… mailing-list
https://lists.debian.org/debian-lts-announce/2020… mailing-list
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.apache.org/thread.html/rbb769f77171… mailing-list
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://security.gentoo.org/glsa/202012-13 vendor-advisory
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.tenable.com/security/tns-2020-11
https://security.netapp.com/advisory/ntap-2020121…
https://kb.pulsesecure.net/articles/Pulse_Securit…
https://lists.apache.org/thread.html/r63c6f2dd363… mailing-list
https://www.oracle.com/security-alerts/cpuApr2021.html
https://www.tenable.com/security/tns-2021-10
https://www.tenable.com/security/tns-2021-09
https://security.netapp.com/advisory/ntap-2021051…
https://www.oracle.com//security-alerts/cpujul2021.html
http://www.openwall.com/lists/oss-security/2021/09/14/2 mailing-list
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://cert-portal.siemens.com/productcert/pdf/s…
https://security.netapp.com/advisory/ntap-2024062…
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h)
Affected: Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)
guessed Create a notification for this product.
Date Public
2020-12-08 00:00
Credits
David Benjamin (Google)
Show details on NVD website
To clipboard 

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            "lang": "en",
            "value": "The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL\u0027s s_server, s_client and verify tools have support for the \"-crl_download\" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL\u0027s parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)."
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          {
            "lang": "es",
            "value": "El tipo GeneralName X.509 es un tipo gen\u00e9rico para representar diferentes tipos de nombres.\u0026#xa0;Uno de esos tipos de nombres se conoce como EDIPartyName.\u0026#xa0;OpenSSL proporciona una funci\u00f3n GENERAL_NAME_cmp que compara diferentes instancias de GENERAL_NAME para ver si son iguales o no.\u0026#xa0;Esta funci\u00f3n se comporta incorrectamente cuando ambos GENERAL_NAME contienen un EDIPARTYNAME.\u0026#xa0;Es posible que se produzca una desreferencia del puntero NULL y un bloqueo que conduzca a un posible ataque de denegaci\u00f3n de servicio.\u0026#xa0;El propio OpenSSL usa la funci\u00f3n GENERAL_NAME_cmp para dos prop\u00f3sitos:\u0026#xa0;1) Comparaci\u00f3n de nombres de puntos de distribuci\u00f3n de CRL entre una CRL disponible y un punto de distribuci\u00f3n de CRL insertado en un certificado X509 2) Al comparar que un firmante de token de respuesta de marca de tiempo coincide con el nombre de autoridad de marca de tiempo (expuesto por medio de las funciones API TS_RESP_verify_response y TS_RESP_verify_token) Si un atacante puede controlar ambos elementos que se est\u00e1n comparando, entonces ese atacante podr\u00eda desencadenar un bloqueo.\u0026#xa0;Por ejemplo, si el atacante puede enga\u00f1ar a un cliente o servidor para que compruebe un certificado malicioso con una CRL maliciosa, esto puede ocurrir.\u0026#xa0;Tome en cuenta que algunas aplicaciones descargan autom\u00e1ticamente las CRL basadas en una URL insertada en un certificado.\u0026#xa0;Esta comprobaci\u00f3n ocurre antes de que se verifiquen las firmas en el certificado y la CRL.\u0026#xa0;Las herramientas s_server, s_client y verify de OpenSSL tienen soporte para la opci\u00f3n \"-crl_download\"\u0026#xa0;que implementa la descarga autom\u00e1tica de CRL y se ha demostrado que este ataque funciona contra esas herramientas.\u0026#xa0;Tome en cuenta que un error no relacionado significa que las versiones afectadas de OpenSSL no pueden analizar ni construir codificaciones correctas de EDIPARTYNAME.\u0026#xa0;Sin embargo, es posible construir un EDIPARTYNAME malformado que el analizador de OpenSSL aceptar\u00e1 y, por lo tanto, desencadenar\u00e1 este ataque.\u0026#xa0;Todas las versiones de OpenSSL 1.1.1 y 1.0.2 est\u00e1n afectadas por este problema.\u0026#xa0;Otras versiones de OpenSSL no son compatibles y no se han comprobado.\u0026#xa0;Corregido en OpenSSL versiones 1.1.1i (Afectado versiones 1.1.1-1.1.1h).\u0026#xa0;Corregido en OpenSSL versiones 1.0.2x (Afectado versiones 1.0.2-1.0.2w).\u0026#xa0;Sin embargo, es posible construir un EDIPARTYNAME malformado que el analizador de OpenSSL aceptar\u00e1 y, por lo tanto, desencadenar\u00e1 este ataque.\u0026#xa0;Todas las versiones de OpenSSL 1.1.1 y 1.0.2 est\u00e1n afectadas por este problema.\u0026#xa0;Otras versiones de OpenSSL no son compatibles y no se han comprobado.\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.1.1i (Afectada versi\u00f3n 1.1.1-1.1.1h).\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.0.2x (Afectada versi\u00f3n 1.0.2-1.0.2w).\u0026#xa0;Sin embargo, es posible construir un EDIPARTYNAME malformado que el analizador de OpenSSL aceptar\u00e1 y, por lo tanto, desencadenar\u00e1 este ataque.\u0026#xa0;Todas las versiones de OpenSSL 1.1.1 y 1.0.2 est\u00e1n afectadas por este problema.\u0026#xa0;Otras versiones de OpenSSL no son compatibles y no se han comprobado.\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.1.1i (Afectada versi\u00f3n 1.1.1-1.1.1h).\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.0.2x (Afectada versi\u00f3n 1.0.2-1.0.2w)"
          }
        ],
        "id": "CVE-2020-1971",
        "lastModified": "2026-05-29T16:16:20.507",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "MEDIUM",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 4.3,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 8.6,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 3.6,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ]
        },
        "published": "2020-12-08T16:15:11.730",
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        ],
        "sourceIdentifier": "openssl-security@openssl.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T11:56:21+00:00",
      "cve": "CVE-2020-1971",
      "id": "CVE-2020-1971",
      "initial_release_date": "2020-12-08T00:00:00+00:00",
      "product_status:fixed": "510",
      "product_status:known_affected": "3",
      "product_status:known_not_affected": "10",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssl: EDIPARTYNAME NULL pointer de-reference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-1971.json",
      "version": "3"
    },
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                "name": "[pulsar-commits] 20201216 [GitHub] [pulsar] phijohns-tibco opened a new issue #8978: OpenSSL needs to be updated to 1.1.1i current version is unsupported.",
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            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "HIGH",
                  "attackVector": "NETWORK",
                  "availabilityImpact": "HIGH",
                  "baseScore": 5.9,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2020-1971",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
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                    "role": "CISA Coordinator",
                    "timestamp": "2026-05-29T15:40:23.131860Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-476",
                    "description": "CWE-476 NULL Pointer Dereference",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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            "title": "CISA ADP Vulnrichment"
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        ],
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          "affected": [
            {
              "product": "OpenSSL",
              "vendor": "OpenSSL",
              "versions": [
                {
                  "status": "affected",
                  "version": "Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h)"
                },
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                  "status": "affected",
                  "version": "Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)"
                }
              ]
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          ],
          "credits": [
            {
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              "value": "David Benjamin (Google)"
            }
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          "datePublic": "2020-12-08T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL\u0027s s_server, s_client and verify tools have support for the \"-crl_download\" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL\u0027s parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)."
            }
          ],
          "metrics": [
            {
              "other": {
                "content": {
                  "lang": "eng",
                  "url": "https://www.openssl.org/policies/secpolicy.html#High",
                  "value": "High"
                },
                "type": "unknown"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "NULL pointer dereference",
                  "lang": "en",
                  "type": "text"
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            "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
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            {
              "name": "[pulsar-commits] 20201216 [GitHub] [pulsar] phijohns-tibco opened a new issue #8978: OpenSSL needs to be updated to 1.1.1i current version is unsupported.",
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            },
            {
              "name": "GLSA-202012-13",
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            {
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              "url": "https://security.netapp.com/advisory/ntap-20201218-0005/"
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              "url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44676"
            },
            {
              "name": "[tomcat-dev] 20210207 [Bug 65126] New: A security vulnerability cve-2020-1971 in Tomcat dependency Library in version 9.0.40.",
              "tags": [
                "mailing-list"
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              "url": "https://lists.apache.org/thread.html/r63c6f2dd363d9b514d0a4bcf624580616a679898cc14c109a49b750c%40%3Cdev.tomcat.apache.org%3E"
            },
            {
              "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
            },
            {
              "url": "https://www.tenable.com/security/tns-2021-10"
            },
            {
              "url": "https://www.tenable.com/security/tns-2021-09"
            },
            {
              "url": "https://security.netapp.com/advisory/ntap-20210513-0002/"
            },
            {
              "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
            },
            {
              "name": "[oss-security] 20210914 Re: Oracle Solaris membership in the distros list",
              "tags": [
                "mailing-list"
              ],
              "url": "http://www.openwall.com/lists/oss-security/2021/09/14/2"
            },
            {
              "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
            },
            {
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
            },
            {
              "url": "https://security.netapp.com/advisory/ntap-20240621-0006/"
            }
          ],
          "title": "EDIPARTYNAME NULL pointer dereference"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "assignerShortName": "openssl",
        "cveId": "CVE-2020-1971",
        "datePublished": "2020-12-08T15:30:16.835Z",
        "dateReserved": "2019-12-03T00:00:00.000Z",
        "dateUpdated": "2026-05-29T15:40:28.488Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.