ZeroDay Findings
Sign inSign up

Findings

CVE-2023-0465

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Published Mar 28, 2023 · updated Oct 14, 2026 · openssl openssl

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether. Policy processing is disabled by default but can be enabled by passing the X509_VERIFY_PARAM_set1_policies()' function.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 28, 2023 · NIST NVD

    Detected

    Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to ci

  2. Oct 14, 2026 · NIST NVD

    Updated

    Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to ci

Affected

  • cpe openssl/opensslversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2023-0465

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-0465

    30-day exploitation probability 1.8%

    first.org
  • NIST NVDVulnerability recordCVE-2023-0465

    Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipp

    nvd.nist.gov

References