The IMAP service for MailEnable Professional and Enterprise Edition 2.0 through 2.34, Professional Edition 1.6 through 1.83, and Enterprise Edition 1.1 through 1.40 allows remote attackers to cause a denial of service (crash) via unspecified vectors that trigger a null pointer dereference, as addressed by the ME-10023 hotfix, and a different issue than CVE-2006-6423.  NOTE: some details were obtained from third party information.