Microsoft Office Excel 2000 SP3, 2002 SP3, 2003 SP3, and 2007 SP1; Excel in Microsoft Office 2004 and 2008 for Mac; Microsoft Office Excel Viewer and Excel Viewer 2003 SP3; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 do not properly parse the Excel spreadsheet file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet that contains a malformed object with "an offset and a two-byte value" that trigger a memory calculation error, aka "Memory Corruption Vulnerability."
Conclusion & alert: CVE-2009-0100 is rated High Risk (67.1/100): CVSS Critical severity, with high exploitation likelihood (EPSS 57.22%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-11-01 | 61.65% | 57.22% | -4.44% |
| 2 | 2025-09-04 | 63.80% | 61.65% | -2.15% |
| 3 | 2025-03-30 | — | 63.80% | — |
Full EPSS history (24 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| microsoft | office | 2004 | cpe:2.3:a:microsoft:office:2004:*:mac:*:*:*:*:* |
| microsoft | office | 2008 | cpe:2.3:a:microsoft:office:2008:*:mac:*:*:*:*:* |
| microsoft | office_compatibility_pack_for_word_excel_ppt_2007 | — | cpe:2.3:a:microsoft:office_compatibility_pack_for_word_excel_ppt_2007:*:sp1:*:*:*:*:*:* |
| microsoft | office_excel | 2000 | cpe:2.3:a:microsoft:office_excel:2000:sp3:*:*:*:*:*:* |
| microsoft | office_excel | 2002 | cpe:2.3:a:microsoft:office_excel:2002:sp3:*:*:*:*:*:* |
| microsoft | office_excel | 2003 | cpe:2.3:a:microsoft:office_excel:2003:sp3:*:*:*:*:*:* |
| microsoft | office_excel | 2007 | cpe:2.3:a:microsoft:office_excel:2007:sp1:*:*:*:*:*:* |
| microsoft | office_excel_viewer | — | cpe:2.3:a:microsoft:office_excel_viewer:*:*:*:*:*:*:*:* |
| microsoft | office_excel_viewer | 2003 | cpe:2.3:a:microsoft:office_excel_viewer:2003:sp3:*:*:*:*:*:* |