CVE-2009-0561

What it is

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."

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

36.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2009-02-12 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2009-06-10 18:30 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 23:05 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 36.9% in the next 30 days (EPSS).
• Severity: 9.3 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2009-06-10 18:30 UTC

Last modified

2026-06-16 23:05 UTC

Exploit probability

36.9% · EPSS, next 30 days

Weakness

CWE-189

Record status

Modified

Affected

• Microsoft Office 2004
• Microsoft Office 2008
• Microsoft Office Xp
• Microsoft Office Compatibility Pack For Word Excel Ppt 2007
• Microsoft Office Excel 2000
• Microsoft Office Excel 2003
• Microsoft Office Excel 2007
• Microsoft Office Excel Viewer

Attack profile CVSS 2.0 · 9.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-0561.md and follow it. Check whether this project is affected by CVE-2009-0561. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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