CVE-2009-0561: Microsoft Office

High severity, CVSS 9.3. EPSS: 36.9% chance of exploitation in the next 30 days.

Integer overflow in Excel in Microsoft Office 2000 SP3, Office XP SP3, Office 2003 SP3, and Office 2004 and 2008 for Mac; Excel in 2007 Microsoft Office System SP1 and SP2; Open XML File Format Converter for Mac; Microsoft Office Excel Viewer 2003 SP3; Microsoft Office Excel Viewer; Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2; and Microsoft Office SharePoint Server 2007 SP1 and SP2 allows remote attackers to execute arbitrary code via an Excel file with a Shared String Table (SST) record with a numeric field that specifies an invalid number of unique strings, which triggers a heap-based buffer overflow, aka "Record Integer Overflow Vulnerability."

Affected products

• Microsoft Office: version 2004 only; version 2008 only; version xp only
• Microsoft Office Compatibility Pack For Word Excel Ppt 2007: any version
• Microsoft Office Excel: version 2000 only; version 2003 only; version 2007 only
• Microsoft Office Excel Viewer: any version; version 2003 only
• Microsoft Office SharePoint Server: version 2007 only
• Microsoft Open XML File Format Converter: any version

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