Microsoft Internet Explorer showModelessDialog() denial of service

ie-modeless-dialog-dos (7826) The risk level is classified as MediumMedium Risk


Microsoft Internet Explorer is vulnerable to a denial of service attack, caused by a recursive call in the showModelessDialog() JavaScript function. A malicious Web site operator could create a Web page containing a malicious JavaScript showModelessDialog() function that is passed to the Web page that it is included in as the parameter. Once the page is visited, Internet Explorer would enter an infinite loop that could eventually consume 100% of the CPU resources.


Denial of Service


No remedy available as of September 1, 2014.


  • BugTraq Mailing List, Sun Jan 06 2002 - 04:44:34 CST: Internet Explorer Javascript Modeless Popup Local Denial of Service Vulnerability.
  • BID-3789: Microsoft Internet Explorer Modeless Dialog DoS Vulnerability
  • CVE-2002-0101: Microsoft Internet Explorer 6.0 and earlier allows local users to cause a denial of service via an infinite loop for modeless dialogs showModelessDialog, which causes CPU usage while the focus for the dialog is not released.
  • OSVDB ID: 7852: Microsoft IE showModelessDialog Infinite Loop DoS

Platforms Affected:

  • Microsoft Internet Explorer 5.5
  • Microsoft Internet Explorer 6.0


Jan 06, 2002

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