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CVE-2009-3129

CISA KEV

Published March 3, 2022 · Updated April 3, 2026

high
Official Description+

Microsoft Office Excel allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset.

Affected Products

VendorProduct
MicrosoftExcel

Patch Status

Patch by 2022-03-24

Recommended Actions

  1. Check if your systems use any of the affected products listed above.
  2. Apply vendor patches immediately if available.
  3. This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
  4. Monitor vendor advisories for updates and additional mitigations.
  5. Review logs for indicators of compromise related to CVE-2009-3129.