When 'curl --ciphers' command is executed why it immediately returns"curl: (59) Unknown cipher in list: NULL-MD5" error ?

Issue

• With "openssl ciphers" I get a long list of supported ciphers.
  "curl --ciphers NULL-MD5 https://..." connects to the host and returns immediately "curl: (59) Unknown cipher in list: NULL-MD5".
  I tried all ciphers, also RHEL 7, but nothing helps. I have got a CentOS 6.5 server with "curl 7.33.0" and "OpenSSL 1.0.1m". There curl works as expected.