Vulnerability in Openssl
CVE-2023-0464
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.
Vulnerability class: Improper Certificate Validation
EPSS: 0.037 (88.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Openssl — versions 3.1.0, 3.0.0, 1.1.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openssl-security@openssl.org (vendor-advisory, Vendor Advisory)
- openssl-security@openssl.org (Patch, Mailing List, patch)
- openssl-security@openssl.org (Patch, Mailing List, patch)
- openssl-security@openssl.org (Patch, Mailing List, patch)
- openssl-security@openssl.org (patch, Broken Link)
- openssl-security@openssl.org
- openssl-security@openssl.org
- openssl-security@openssl.org
- openssl-security@openssl.org
- openssl-security@openssl.org
Frequently asked questions
- What is CVE-2023-0464?
- CVE-2023-0464 is a high-severity vulnerability in Openssl, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2023-03-22.
- How severe is CVE-2023-0464?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-0464 known to be exploited?
- 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.