|The ASN1_TYPE_cmp function in crypto/asn1/a_type.c in OpenSSL before
0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and 1.0.2 before
1.0.2a does not properly perform boolean-type comparisons, which
allows remote attackers to cause a denial of service (invalid read
operation and application crash) via a crafted X.509 certificate to an
endpoint that uses the certificate-verification feature.