The reported issues are part of the libopensc library, which makes them accessible from OpenSC tools, PKCS#11 module, minidriver, or CTK. One is only relevant to handling the card enrollment using the pkcs15-init tool. The attack requires a crafted USB device or smart card that would present the system with specially crafted responses to the APDUs, so they are considered high complexity and low severity. The problem is missing initialization of variables expected to be initialized (as arguments to other functions, etc.). The uninitialized variables were reflected in the following functions: - cac_read_file - piv_get_challenge - sc_asn1_decode_object_id - sc_pkcs15emu_sc_hsm_decode_cvc - do_init_app, sc_pkcs15init_create_pin Originally reported by Matteo Marini (Sapienza University of Rome)