CVE-2010-1249: Microsoft Excel

High severity, CVSS 9.3. EPSS: 24.8% chance of exploitation in the next 30 days.

Buffer overflow in Microsoft Office Excel 2002 SP3, Office 2004 for Mac, Office 2008 for Mac, and Open XML File Format Converter for Mac allows remote attackers to execute arbitrary code via an Excel file with a malformed ExternName (0x23) record, aka "Excel Memory Corruption Vulnerability," a different vulnerability than CVE-2010-0823 and CVE-2010-1247.

Affected products

• Microsoft Excel: version 2002 only
• Microsoft Office: version 2004 only; version 2008 only
• Microsoft Open XML File Format Converter: any version

Published 2010-06-08. Last modified 2026-06-16.