The Microsoft virtual machine (VM) in Internet Explorer 4.x and 5.x allows a remote attacker to read files via a malicious Java applet that escapes the Java sandbox, aka the "VM File Reading" vulnerability.

Internet Explorer 5.0 and 5.01 allows remote attackers to bypass the cross frame security policy and read files via the external.NavigateAndFind function.

Outlook Express 5 for Macintosh downloads attachments to HTML mail without prompting the user, aka the "HTML Mail Attachment" vulnerability.

Buffer overflow in Internet Explorer 5 directshow filter (MSDXM.OCX) allows remote attackers to execute commands via the vnd.ms.radio protocol.

Windows NT Task Scheduler installed with Internet Explorer 5 allows a user to gain privileges by modifying the job after it has been scheduled.

A Microsoft ActiveX control allows a remote attacker to execute a malicious cabinet file via an attachment and an embedded script in an HTML mail, aka the "Active Setup Control" vulnerability.

By default, Internet Explorer 5.0 and other versions enables the "Navigate sub-frames across different domains" option, which allows frame spoofing.

Vixie Cron on Linux systems allows local users to set parameters of sendmail commands via the MAILTO environmental variable.

Buffer overflow in Vixie cron allows local users to gain root access via a long MAILTO environment variable in a crontab file.