Apple » Software Update : Security Vulnerabilities, CVEs,

Apple Software Update before 2.2 on Windows does not use HTTPS, which makes it easier for man-in-the-middle attackers to spoof updates by modifying the client-server data stream.

Format string vulnerability in Apple Software Update 2.0.5 on Mac OS X 10.4.8 allows remote attackers to cause a denial of service (application crash) or execute arbitrary code via format string specifiers in (1) SWUTMP or (2) SUCATALOG filenames, or using the (3) application/x-apple.sucatalog+xml MIME type.