CVE-2020-1971

Advisory lineage Upstream: 0 Downstream: 47
Modified
Published: 08 Dec 2020, 15:30
Last modified:29 May 2026, 15:40

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (nvd)
EPSS Score
0.35% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

08 Dec 2020, 15:30
Published
Vulnerability first disclosed
29 May 2026, 15:40
Last Modified
Vulnerability information updated

Description

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).

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 4.3AV:N/AC:M/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.35%• Percentile: 58%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • debian•debian_linux

    9.0 | 10.0

  • fedoraproject•fedora

    32 | 33

  • netapp•active_iq_unified_manager

    na

  • netapp•aff_a250_firmware

    na

  • netapp•clustered_data_ontap_antivirus_connector

    na

  • netapp•data_ontap

    na

  • netapp•e-series_santricity_os_controller

    ≥ 11.0.0, ≤ 11.60.3

  • netapp•ef600a_firmware

    na

  • netapp•hci_compute_node_firmware

    na

  • netapp•hci_management_node

    na

  • netapp•hci_storage_node

    na

  • netapp•manageability_software_development_kit

    na

  • netapp•oncommand_insight

    na

  • netapp•oncommand_workflow_automation

    na

  • netapp•plug-in_for_symantec_netbackup

    na

  • netapp•santricity_smi-s_provider

    na

  • netapp•snapcenter

    na

  • netapp•solidfire

    na

  • nodejs•node.js

    ≥ 10.0.0, ≤ 10.12.0 | ≥ 10.13.0, < 10.23.1 | ≥ 12.0.0, ≤ 12.12.0 | ≥ 12.13.0, < 12.20.1 | ≥ 14.0.0, ≤ 14.14.0 | ≥ 14.15.0, < 14.15.4 | ≥ 15.0.0, < 15.5.0

  • Unknown•OpenSSL

    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) | ≥ 1.0.2, < 1.0.2x | ≥ 1.1.1, < 1.1.1i

  • oracle•api_gateway

    11.1.2.4.0

  • oracle•business_intelligence

    5.5.0.0.0 | 5.9.0.0.0 | 12.2.1.3.0 | 12.2.1.4.0

  • oracle•communications_cloud_native_core_network_function_cloud_native_environment

    1.10.0

  • oracle•communications_diameter_intelligence_hub

    ≥ 8.0.0, ≤ 8.1.0 | ≥ 8.2.0, ≤ 8.2.3

  • oracle•communications_session_border_controller

    cz8.2 | cz8.3 | cz8.4

  • oracle•communications_session_router

    cz8.2 | cz8.3 | cz8.4

  • oracle•communications_subscriber-aware_load_balancer

    cz8.2 | cz8.3 | cz8.4

  • oracle•communications_unified_session_manager

    scz8.2.5

  • oracle•enterprise_communications_broker

    pcz3.1 | pcz3.2 | pcz3.3

  • oracle•enterprise_manager_base_platform

    13.3.0.0 | 13.4.0.0

  • oracle•enterprise_manager_for_storage_management

    13.4.0.0

  • oracle•enterprise_manager_ops_center

    12.4.0.0

  • oracle•enterprise_session_border_controller

    cz8.2 | cz8.3 | cz8.4

  • oracle•essbase

    21.2

  • oracle•graalvm

    19.3.4 | 20.3.0

  • oracle•http_server

    12.2.1.4.0

  • oracle•jd_edwards_enterpriseone_tools

    < 9.2.5.3

  • oracle•jd_edwards_world_security

    a9.4

  • oracle•mysql

    ≤ 8.0.22

  • oracle•mysql_server

    ≤ 5.7.32 | ≥ 8.0.15, ≤ 8.0.22

  • oracle•peoplesoft_enterprise_peopletools

    8.56 | 8.57 | 8.58

  • siemens•sinec_infrastructure_network_services

    < 1.0.1.1

  • tenable•log_correlation_engine

    < 6.0.9

  • tenable•nessus_network_monitor

    < 5.13.1

References (26)