OpenSSL -- CMS and S/MIME Bleichenbacher attack

The OpenSSL Team reports:

A weakness in the OpenSSL CMS and PKCS #7 code can be exploited
using Bleichenbacher’s attack on PKCS #1 v1.5 RSA padding
also known as the million message attack (MMA).
Only users of CMS, PKCS #7, or S/MIME decryption operations are
affected. A successful attack needs on average 2^20 messages. In
practice only automated systems will be affected as humans will
not be willing to process this many messages.
SSL/TLS applications are NOT affected by this problem since
the SSL/TLS code does not use the PKCS#7 or CMS decryption
code.