CVE-2003-0881
Mail in Mac OS X before 10.3, when configured to use MD5 Challenge Response, uses plaintext authentication if the CRAM-MD5 hashed login fails, which could allow remote attackers to gain privileges by sniffing the password.
Date published : 2003-10-30
http://docs.info.apple.com/article.html?artnum=61798
http://lists.apple.com/mhonarc/security-announce/msg00038.html