CVE-2020-1971 (GCVE-0-2020-1971)
Vulnerability from cvelistv5 – Published: 2020-12-08 15:30 – Updated: 2026-05-29 15:40
VLAI
EPSS
VEX
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)
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
26 references
Impacted products
Date Public
2020-12-08 00:00
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"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": "2024-11-21T05:11:45.673",
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"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
"version": "2.0"
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"exploitabilityScore": 8.6,
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"published": "2020-12-08T16:15:11.730",
"references": [
{
"source": "openssl-security@openssl.org",
"tags": [
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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)"
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],
"id": "CVE-2020-1971",
"lastModified": "2026-05-29T16:16:20.507",
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"published": "2020-12-08T16:15:11.730",
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}
}
Loading…
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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.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.