Microsoft Word Malformed Document Buffer Overflow Vulnerability



Date Discovered

April 12, 2005


Microsoft Word is prone to a buffer overflow vulnerability. This issue presents itself when Microsoft Word attempts to parse a malformed document. This could result in execution of arbitrary code in the context of a user who opens the malicious document. Internet Explorer is a likely attack vector as Word may be opened to handle the document when the user clicks a link. This issue was originally described as part of BID 11350.

Technologies Affected

  • Microsoft Word 2000
  • Microsoft Word 2000 Chinese Version
  • Microsoft Word 2000 Japanese Version
  • Microsoft Word 2000 Korean Version
  • Microsoft Word 2000 SP2
  • Microsoft Word 2000 SP3
  • Microsoft Word 2000 SR1
  • Microsoft Word 2000 SR1a
  • Microsoft Word 2002
  • Microsoft Word 2002 SP1
  • Microsoft Word 2002 SP2
  • Microsoft Word 2002 SP3
  • Microsoft Word 2003
  • Microsoft Word 2003 Viewer
  • Microsoft Works Suite 2001
  • Microsoft Works Suite 2002
  • Microsoft Works Suite 2003
  • Microsoft Works Suite 2004


Do not accept or execute files from untrusted or unknown sources.
Users should be wary of opening any files that originate from an untrusted or unfamiliar source.

Run all software as a nonprivileged user with minimal access rights.
Running the affected application as a user with minimal access rights may greatly prove to help mitigate the impact of successful exploitation.

Microsoft has released updates to address this issue in supported versions of affected software. UPDATE: Fixes are available for Microsoft Word 2003 Viewer.



Discovery is credited to Alex Li.

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