CVE-2009-0561

Integer overflow in Excel in Microsoft Office 2000 SP3, Office XP SP3, Office 2003 SP3, and Office 2004 and 2008 for Mac; Excel in 2007 Microsoft Office System SP1 and SP2; Open XML File Format Converter for Mac; Microsoft Office Excel Viewer 2003 SP3; Microsoft Office Excel Viewer; Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2; and Microsoft Office SharePoint Server 2007 SP1 and SP2 allows remote attackers to execute arbitrary code via an Excel file with a Shared String Table (SST) record with a numeric field that specifies an invalid number of unique strings, which triggers a heap-based buffer overflow, aka "Record Integer Overflow Vulnerability."

Published: 2009-06-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-0561 is rated High Risk (66.6/100): CVSS Critical severity, with high exploitation likelihood (EPSS 36.90%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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.

Exploit prediction scoring system (EPSS) score for CVE-2009-0561

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 2026-06-15 65.54% 36.90% -28.64%
2 2025-12-27 67.16% 65.54% -1.62%
3 2025-08-27 — 67.16% —

Full EPSS history (25 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-0561

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2009-0561

Affected software / configurations for CVE-2009-0561

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 xp cpe:2.3:a:microsoft:office:xp:sp3:*:*:*:*:*:*
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_compatibility_pack_for_word_excel_ppt_2007 — cpe:2.3:a:microsoft:office_compatibility_pack_for_word_excel_ppt_2007:*:sp2:*:*:*:*:*:*
microsoft office_excel 2000 cpe:2.3:a:microsoft:office_excel:2000: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 2007 cpe:2.3:a:microsoft:office_excel:2007:sp2:*:*:*:*:*:*
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:*:*:*:*:*:*
microsoft office_sharepoint_server 2007 cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp1:x32:*:*:*:*:*
microsoft office_sharepoint_server 2007 cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp1:x64:*:*:*:*:*
microsoft office_sharepoint_server 2007 cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp2:x32:*:*:*:*:*
microsoft office_sharepoint_server 2007 cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp2:x64:*:*:*:*:*
microsoft open_xml_file_format_converter — cpe:2.3:a:microsoft:open_xml_file_format_converter:*:*:mac:*:*:*:*:*

References for CVE-2009-0561

cvelogic Threat Intelligence