|The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is
enabled on a server but not on a client, does not properly convey a
DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct
cipher-downgrade attacks by rewriting a ClientHello with DHE replaced
by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT
replaced by DHE, aka the "Logjam" issue.