OpenSSL before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k does not enforce certain constraints on certificate data, which allows remote attackers to defeat a fingerprint-based certificate-blacklist protection mechanism by including crafted data within a certificate's unsigned portion, related to crypto/asn1/averify.c, crypto/dsa/dsaasn1.c, crypto/ecdsa/ecsvrf.c, and crypto/x509/xall.c.