CVE-2009-0563: Microsoft Office Buffer Overflow Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2022-06-08. EPSS: 62.8% chance of exploitation in the next 30 days.

Stack-based buffer overflow in Microsoft Office Word 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Microsoft Office for Mac 2004 and 2008; Open XML File Format Converter for Mac; Microsoft Office Word Viewer 2003 SP3; Microsoft Office Word Viewer; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows remote attackers to execute arbitrary code via a Word document with a crafted tag containing an invalid length field, aka "Word Buffer Overflow Vulnerability."

Affected products

• Microsoft Office: version 2000 only; version 2003 only; version 2004 only; version 2007 only; version 2008 only; version xp only
• Microsoft Office Compatibility Pack: version 2007 only
• Microsoft Office Word Viewer: affected versions not specified; version 2003 only
• Microsoft Open XML File Format Converter: affected versions not specified

Published 2009-06-10. Last modified 2026-06-16.