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🛡️ CVE-2023-0464 — openssl

🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-295 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-0464 is classified as CWE-295: Improper Certificate Validation. A TLS certificate is accepted without proper verification, so a man-in-the-middle can present their own.

Affected software

CVE-2023-0464 is recorded against 1 package.

  • openssl (from 3.1.0 up to 3.1.1)

Timeline and source

Published on 22 March 2023 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.openssl.org
git.openssl.org
git.openssl.org
git.openssl.org
lists.debian.org
security.gentoo.org
security.netapp.com
www.couchbase.com
www.debian.org
www.openssl.org
git.openssl.org
git.openssl.org
git.openssl.org
git.openssl.org
lists.debian.org
security.gentoo.org
security.netapp.com
security.netapp.com
www.couchbase.com
www.debian.org
www.openssl.org

Other advisories for this package

openssl has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-295: Improper Certificate Validation) in other software:

CVE-2023-0464 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-295
Public Exploit ✅ No
Source NVD
Published 2023-03-22
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
openssl 3.1.0 3.1.1

References

Site Security Check

Is openssl part of your stack?

CVE-2023-0464 is rated CVSS 7.5 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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