---
id: "CVE-2009-0563"
kind: "vulnerability"
aliases: ["CVE-2009-0563"]
title: "Stack-based buffer overflow in Microsoft Office Word 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Microsoft Office for\u2026"
severity: "critical"
cvss: 9.3
epss: 0.59634
exploited: true
status: "open"
category: "package"
products: [{"name": "Microsoft Office", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft office", "fixed": [], "affected": "= 2000", "ecosystem": "vendor"}, {"name": "microsoft office", "fixed": [], "affected": "= 2003", "ecosystem": "vendor"}, {"name": "microsoft office", "fixed": [], "affected": "= 2004", "ecosystem": "vendor"}, {"name": "microsoft office", "fixed": [], "affected": "= 2007", "ecosystem": "vendor"}, {"name": "microsoft office", "fixed": [], "affected": "= 2008", "ecosystem": "vendor"}, {"name": "microsoft office", "fixed": [], "affected": "= xp", "ecosystem": "vendor"}, {"name": "microsoft office compatibility pack", "fixed": [], "affected": "= 2007", "ecosystem": "vendor"}, {"name": "microsoft office word viewer", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft office word viewer", "fixed": [], "affected": "= 2003", "ecosystem": "vendor"}, {"name": "microsoft open xml file format converter", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "microsoft-office", "package", "windows", "word"]
not_affected_if: ["no-word-documents-opened", "office-patched"]
published_at: "2009-06-10T18:00:00+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2009-0563", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2009-0563", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-0563", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# Stack-based buffer overflow in Microsoft Office Word 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Microsoft Office for…

Microsoft Office has a buffer overflow triggered by a crafted Word document with an invalid length field in a tag. An attacker who gets a user to open the file can run code on that user's machine.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Office affected ? fixed ?
- vendor:microsoft office affected = 2000 fixed ?
- vendor:microsoft office affected = 2003 fixed ?
- vendor:microsoft office affected = 2004 fixed ?
- vendor:microsoft office affected = 2007 fixed ?
- vendor:microsoft office affected = 2008 fixed ?
- vendor:microsoft office affected = xp fixed ?
- vendor:microsoft office compatibility pack affected = 2007 fixed ?
- vendor:microsoft office word viewer affected ? fixed ?
- vendor:microsoft office word viewer affected = 2003 fixed ?
- vendor:microsoft open xml file format converter affected ? fixed ?

## Fix

Apply the Microsoft updates for the affected Office version per vendor instructions (CISA KEV required action). Specific patch names are unknown from the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2009-0563
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2009-0563
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2009-0563

## From the sources

Stack-based buffer overflow in Microsoft Office Word 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Microsoft Office for Mac 2004 and 2008; Open XML File Format Converter for Mac; Microsoft Office Word Viewer 2003 SP3; Microsoft Office Word Viewer; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows remote attackers to execute arbitrary code via a Word document with a crafted tag containing an invalid length field, aka "Word Buffer Overflow Vulnerability."

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_