How severe is CVE-2009-3134?

CVE-2009-3134 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-3134 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3134?

CVE-2009-3134 primarily affects Microsoft Compatibility Pack Word Excel Powerpoint. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3134?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-3134 published?

CVE-2009-3134 was published on 2009-11-11 and last updated on 2026-06-16.

CVE-2009-3134

CVE-2009-3134 is a critical-severity vulnerability in Microsoft Compatibility Pack Word Excel Powerpoint with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Microsoft Compatibility Pack Word Excel Powerpoint
Published: 2009-11-11
Last modified: 2026-06-16

Description

Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a spreadsheet with a malformed record object, aka "Excel Field Sanitization Vulnerability."

Frequently asked questions

What is CVE-2009-3134?: Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a spreadsheet with a malformed record object, aka "Excel Field Sanitization Vulnerability."
How severe is CVE-2009-3134?: CVE-2009-3134 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-3134 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3134?: CVE-2009-3134 primarily affects Microsoft Compatibility Pack Word Excel Powerpoint. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3134?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-3134 published?: CVE-2009-3134 was published on 2009-11-11 and last updated on 2026-06-16.

References

Affected products (12)

cpe:2.3:a:microsoft:compatibility_pack_word_excel_powerpoint:2007:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:compatibility_pack_word_excel_powerpoint:2007:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2002:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2003:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2007:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2007:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel_viewer:*:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel_viewer:*:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel_viewer:2003:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office:2004:*:mac:*:*:*:*:*
cpe:2.3:a:microsoft:office:2008:*:mac:*:*:*:*:*
cpe:2.3:a:microsoft:open_xml_file_format_converter:*:*:mac:*:*:*:*:*

More vulnerabilities in Microsoft Compatibility Pack Word Excel Powerpoint

CVE-2009-3133 — Critical (CVSS 9.3): Microsoft Office Excel 2002 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac allow remote…
CVE-2009-3132 — Critical (CVSS 9.3): Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format…
CVE-2009-3131 — Critical (CVSS 9.3): Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format…
CVE-2009-3130 — Critical (CVSS 9.3): Heap-based buffer overflow in Microsoft Office Excel 2002 SP3, Office 2004 and 2008 for Mac, and Open XML File Format…
CVE-2009-3128 — Critical (CVSS 9.3): Microsoft Office Excel 2002 SP3 and 2003 SP3, and Office Excel Viewer 2003 SP3, does not properly parse the Excel file…
CVE-2009-3127 — Critical (CVSS 9.3): Microsoft Office Excel 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, Open XML File Format Converter for Mac, and…

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