CVE-2020-1967 (GCVE-0-2020-1967)
Vulnerability from cvelistv5 – Published: 2020-04-21 13:45 – Updated: 2024-09-17 03:13
VLAI
EPSS
VEX
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.
CWE
- NULL pointer dereference
Assigner
References
32 references
Impacted products
Date Public
2020-04-21 00:00
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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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"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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"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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"url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html"
},
{
"source": "openssl-security@openssl.org",
"tags": [
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"VDB Entry"
],
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},
{
"source": "openssl-security@openssl.org",
"tags": [
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"Third Party Advisory"
],
"url": "http://seclists.org/fulldisclosure/2020/May/5"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://www.openwall.com/lists/oss-security/2020/04/22/2"
},
{
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"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1"
},
{
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"tags": [
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"Third Party Advisory"
],
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},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440"
},
{
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"url": "https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3E"
},
{
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},
{
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"url": "https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3E"
},
{
"source": "openssl-security@openssl.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/"
},
{
"source": "openssl-security@openssl.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/"
},
{
"source": "openssl-security@openssl.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.gentoo.org/glsa/202004-10"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20200424-0003/"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20200717-0004/"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4661"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Vendor Advisory"
],
"url": "https://www.openssl.org/news/secadv/20200421.txt"
},
{
"source": "openssl-security@openssl.org",
"tags": [
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"Third Party Advisory"
],
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"source": "openssl-security@openssl.org",
"tags": [
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"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpujan2021.html"
},
{
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"tags": [
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],
"url": "https://www.oracle.com/security-alerts/cpujul2020.html"
},
{
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"tags": [
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],
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},
{
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"tags": [
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],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
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"tags": [
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],
"url": "https://www.synology.com/security/advisory/Synology_SA_20_05"
},
{
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"tags": [
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],
"url": "https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL"
},
{
"source": "openssl-security@openssl.org",
"tags": [
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],
"url": "https://www.tenable.com/security/tns-2020-03"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.tenable.com/security/tns-2020-04"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.tenable.com/security/tns-2020-11"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.tenable.com/security/tns-2021-10"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://seclists.org/fulldisclosure/2020/May/5"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://www.openwall.com/lists/oss-security/2020/04/22/2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1"
},
{
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"tags": [
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"Third Party Advisory"
],
"url": "https://github.com/irsl/CVE-2020-1967"
},
{
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"tags": [
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],
"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
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},
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"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/"
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{
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{
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{
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{
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{
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{
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},
{
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"url": "https://www.synology.com/security/advisory/Synology_SA_20_05"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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},
{
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{
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{
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{
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"tags": [
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"url": "https://www.tenable.com/security/tns-2021-10"
}
],
"sourceIdentifier": "openssl-security@openssl.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-08-05T03:48:02+00:00",
"cve": "CVE-2020-1967",
"id": "CVE-2020-1967",
"initial_release_date": "2020-04-21T00:00:00+00:00",
"product_status:known_not_affected": "30",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "openssl: Segmentation fault in SSL_check_chain causes denial of service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-1967.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-03T00:53:00Z",
"cve": "CVE-2020-1967",
"id": "CVE-2020-1967",
"initial_release_date": "2023-02-15T04:04:09Z",
"product_status:known_affected": "320",
"product_status:known_not_affected": "753",
"product_status:recommended": "825",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-1967",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-1967.json",
"version": "43"
}
}
}
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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.
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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.
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