OpenSSL Cryptographic Issues Vulnerability - CVE-2011-4354

crypto/bn/bn_nist.c in OpenSSL before 0.9.8h on 32-bit platforms as used in stunnel and other products in certain circumstances involving ECDH or ECDHE cipher suites uses an incorrect modular reduction algorithm in its implementation of the P-256 and P-384 NIST elliptic curves which allows remote attackers to obtain the private key of a TLS server via multiple handshake attempts.