The host is missing a security update according to Apple advisory, APPLE-SA-2013-10-22-7. The update is required to fix a information disclosure vulnerability. The flaws are present in the application, which does not properly use server authentication-type information during decisions about whether to present an unencrypted-connection warning message. Successful exploitation allows remote attackers to obtain sensitive information in opportunistic circumstances by sniffing the network during an unintended cleartext VNC session.