EMC RSA BSAFE Micro Edition Suite (MES) 4.0.x and 4.1.x before 4.1.5, RSA BSAFE Crypto-C Micro Edition (CCME) 4.0.x and 4.1.x before 4.1.3, RSA BSAFE Crypto-J before 6.2.1, RSA BSAFE SSL-J before 6.2.1, and RSA BSAFE SSL-C before 2.8.9 allow remote attackers to discover a private-key prime by conducting a Lenstra side-channel attack that leverages an application's failure to detect an RSA signature failure during a TLS session.