CVE-2012-2543: Stack-based buffer overflow in Microsoft Excel 2007 SP2 and SP3 and 2010 SP1; Office 2011 for Mac; Excel Vi...

Security readout for executives and security teams

This is an old Microsoft Excel remote code execution flaw. A crafted spreadsheet could trigger a stack buffer overflow and let an attacker run code when opened in affected Excel or Office components. It matters most where legacy Office versions still handle untrusted files. Exposure is most likely on endpoints or servers that still run the listed legacy Microsoft Office, Excel Viewer, or Compatibility Pack versions and can open spreadsheets from email, web downloads, shared drives, or external partners. Prioritize remediation if legacy Office software remains in production or receives external spreadsheets. The business risk is code execution from a document, but urgency depends on whether these old products still exist in the environment. Mitigation focus: Review Microsoft MS12-076 and apply applicable security updates.; Retire unsupported legacy Office, Excel Viewer, and Compatibility Pack deployments.; Limit opening of untrusted spreadsheets from email, web, and shared folders..

Prepared

Jun 24, 2026, 12:04 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.