CVE-2023-0286: OpenSSL

High severity, CVSS 7.4. EPSS: 59.5% chance of exploitation in the next 30 days.

There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag), this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call, enabling them to read memory contents or enact a denial of service. In most cases, the attack requires the attacker to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one of these inputs, the other input must already contain an X.400 address as a CRL distribution point, which is uncommon. As such, this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.

Affected products

• OpenSSL OpenSSL: from 1.0.2, before 1.0.2zg (fixed in 1.0.2zg); from 1.1.1, before 1.1.1t (fixed in 1.1.1t); from 3.0.0, before 3.0.8 (fixed in 3.0.8)
• Stormshield Stormshield Management Center: before 3.3.3 (fixed in 3.3.3)
• Stormshield Stormshield Network Security: from 2.7.0, before 2.7.11 (fixed in 2.7.11); from 2.8.0, before 3.7.34 (fixed in 3.7.34); from 3.8.0, before 3.11.22 (fixed in 3.11.22); from 4.0.0, before 4.3.16 (fixed in 4.3.16); from 4.4.0, before 4.6.3 (fixed in 4.6.3)

Published 2023-02-08. Last modified 2026-06-17.