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CVE-2009-0563

KEVMicrosoft Office Buffer Overflow Vulnerability

Microsoft Office contains a buffer overflow vulnerability that allows remote attackers to execute code via a Word document with a crafted tag containing an invalid length field.

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."

CVSS 3.1 vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
PublishedJun 10, 2009
Last modifiedJun 16, 2026
Added to KEVJun 8, 2022
Remediation dueJun 22, 2022
    75
    Risk assessment · High

    Actively exploited. Patch immediately.

    Exploitation
    Confirmed in the wild (CISA KEV)
    Federal remediation deadline
    Overdue by 1587 days
    CVSS
    7.8 HIGH
    EPSS (30-day exploit probability)
    59.6% · top 1% of all CVEs
    Weakness
    CWE-787
    1. 1.Apply updates per vendor instructions.
    2. 2.Treat as emergency change: patch or isolate internet-facing instances first.
    3. 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

    Assessment is derived automatically from the live signals above; verify against your own asset inventory.