---
id: CVE-2023-0464
title: |-
  A security vulnerability has been identified in all supported versions

  of OpenSSL related to the verification of X.509 certificate chains
  that include policy constraints
summary: |-
  A security vulnerability has been identified in all supported versions

  of OpenSSL related to the verification of X.509 certificate chains
  that include policy constraints.  Attackers may be able to exploit this
  vulnerability by creating …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-295
  - CWE-295
vendor: openssl
product: openssl
affected:
  - 'openssl >= 1.0.2, < 1.0.2zh'
  - 'openssl >= 1.1.1, < 1.1.1u'
  - 'openssl >= 3.0.0, < 3.0.9'
  - 'openssl >= 3.1.0, < 3.1.1'
patched:
  - openssl 3.1.1
published: '2023-03-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:17:23.470'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-0464'
references:
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2017771e2db3e2b96f89bbe8766c3209f6a99545
    label: openssl-security@openssl.org
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2dcd4f1e3115f38cefa43e3efbe9b801c27e642e
    label: openssl-security@openssl.org
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=879f7080d7e141f415c79eaa3a8ac4a3dad0348b
    label: openssl-security@openssl.org
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=959c59c7a0164117e7f8366466a32bb1f8d77ff1
    label: openssl-security@openssl.org
  - url: 'https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html'
    label: openssl-security@openssl.org
  - url: 'https://security.gentoo.org/glsa/202402-08'
    label: openssl-security@openssl.org
  - url: 'https://security.netapp.com/advisory/ntap-20240621-0006/'
    label: openssl-security@openssl.org
  - url: 'https://www.couchbase.com/alerts/'
    label: openssl-security@openssl.org
  - url: 'https://www.debian.org/security/2023/dsa-5417'
    label: openssl-security@openssl.org
  - url: 'https://www.openssl.org/news/secadv/20230322.txt'
    label: openssl-security@openssl.org
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2017771e2db3e2b96f89bbe8766c3209f6a99545
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2dcd4f1e3115f38cefa43e3efbe9b801c27e642e
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=879f7080d7e141f415c79eaa3a8ac4a3dad0348b
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=959c59c7a0164117e7f8366466a32bb1f8d77ff1
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202402-08'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20230406-0006/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20240621-0006/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.couchbase.com/alerts/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5417'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.openssl.org/news/secadv/20230322.txt'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-028723.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-077170.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-337522.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-341067.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-556635.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-625862.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-769027.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-879734.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - exploit-available
epss: 0.03658
epssPercentile: 0.89438
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Trinadh465/Openssl_1.1.1g_CVE-2023-0464'
  checkedAt: '2026-10-14T20:53:46.784Z'
exploitAvailable: true
ingestedAt: '2026-10-14T20:53:12.257Z'
---

## Overview

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains
that include policy constraints.  Attackers may be able to exploit this
vulnerability by creating a malicious certificate chain that triggers
exponential use of computational resources, leading to a denial-of-service
(DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing
the `-policy' argument to the command line utilities or by calling the
`X509_VERIFY_PARAM_set1_policies()' function.

## Affected

- `openssl >= 1.0.2, < 1.0.2zh`
- `openssl >= 1.1.1, < 1.1.1u`
- `openssl >= 3.0.0, < 3.0.9`
- `openssl >= 3.1.0, < 3.1.1`

## Remediation

Upgrade past the affected range:

- `openssl 3.1.1`