← Vulnerability feed

Vulnerability record · CVE-2009-0561 · published 10 June 2009

CVE-2009-0561: Microsoft office vulnerability

Microsoft · Office

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."

9.3 CVSS 2.0 High EPSS 37% · top 1.5% CWE-189 · CWE-189
9.3CVSS 2.0 base score
37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

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."

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=805
http://osvdb.org/54957
http://secunia.com/secunia_research/2009-12/ Vendor Advisory
http://www.securityfocus.com/archive/1/504190/100/0/threaded
http://www.securityfocus.com/bid/35245
http://www.securitytracker.com/id?1022351
http://www.us-cert.gov/cas/techalerts/TA09-160A.html US Government Resource
http://www.vupen.com/english/advisories/2009/1540 Vendor Advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-021
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5925
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=805
http://osvdb.org/54957
http://secunia.com/secunia_research/2009-12/ Vendor Advisory
http://www.securityfocus.com/archive/1/504190/100/0/threaded
http://www.securityfocus.com/bid/35245
http://www.securitytracker.com/id?1022351
http://www.us-cert.gov/cas/techalerts/TA09-160A.html US Government Resource
http://www.vupen.com/english/advisories/2009/1540 Vendor Advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-021
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5925

Track CVE-2009-0561 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-23397Microsoft Outlook improper input validation privilege escalationCVE-2023-23397 is a critical elevation of privilege flaw in Microsoft Outlook caused by improper input validation and an authentication bypass by cap…KEVEPSS 97%analysed8.8CVE-2023-35311Microsoft Outlook security feature bypass via TOCTOU race conditionCVE-2023-35311 is a security feature bypass in Microsoft Outlook caused by a time-of-check time-of-use (TOCTOU) race condition (CWE-367). It affects …KEVEPSS 16%analysed8.8CVE-2019-1297Microsoft Excel memory handling flaw allows remote code executionCVE-2019-1297 is a remote code execution vulnerability in Microsoft Excel caused by improper handling of objects in memory. An attacker who convinces…KEVEPSS 22%analysed8.8CVE-2019-0541Microsoft MSHTML engine input validation flaw allows remote code executionThe MSHTML engine in Microsoft Office, Internet Explorer and related viewers fails to properly validate input, allowing remote code execution. Becaus…KEVEPSS 53%analysed8.8CVE-2018-0798Microsoft Office Equation Editor memory corruption RCEEquation Editor in Microsoft Office 2007 through 2016 mishandles objects in memory, producing an out-of-bounds write (CWE-787) that can be turned int…KEVEPSS 95%analysed8.8CVE-2015-2424Microsoft Office memory corruption via crafted documentCVE-2015-2424 is an out-of-bounds write (CWE-787) in Microsoft PowerPoint and Word that is triggered when a crafted Office document is opened. A remo…KEVEPSS 40%analysed8.8CVE-2015-1770Microsoft Office uninitialized memory use allows remote code executionMicrosoft Office 2013 SP1 and 2013 RT SP1 mishandle uninitialized memory when parsing a crafted Office document, which can lead to arbitrary code exe…KEVEPSS 35%analysed8.8CVE-2012-1856Microsoft Office MSCOMCTL.OCX TabStrip ActiveX Control Remote Code ExecutionThe TabStrip ActiveX control in MSCOMCTL.OCX fails to properly handle system state, allowing a crafted document or web page to corrupt memory and exe…KEVEPSS 72%analysed

Source: NIST National Vulnerability Database (record CVE-2009-0561), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.