The ssl3_send_client_key_exchange function in s3_clnt.c in OpenSSL
before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h, when an
anonymous ECDH cipher suite is used, allows remote attackers to cause
a denial of service (NULL pointer dereference and client crash) by
triggering a NULL certificate value.
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