Microsoft Internet Explorer and Outlook null character in host name denial of service

ie-host-null-dos (15127) The risk level is classified as MediumMedium Risk


Microsoft Internet Explorer and Microsoft Outlook 2002 and 2003 are vulnerable to a denial of service. By creating a specially-crafted URL containing a hostname appended with two null byte characters (%00), a remote attacker could cause the program to consume all available CPU resources and hang, once the URL is clicked.


Denial of Service


Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.


Platforms Affected:

  • Microsoft Internet Explorer 6.0
  • Microsoft Outlook 2002
  • Microsoft Outlook 2003


Feb 10, 2004

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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