CVE-2009-0563

Exp

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."

Published: 2009-06-10 Last update: 2026-04-22 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-0563 is rated Critical Active Threat (91.1/100): CVSS High severity, with high exploitation likelihood (EPSS 63.08%, 99th percentile). CISA KEV confirms active exploitation (added 2022-06-08) affecting Microsoft / Office. a weakness (CWE-787) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2009-0563

Name: Microsoft Office Buffer Overflow Vulnerability · CISA KEV detail

Exploit added: 2022-06-08

Action due: 2022-06-22

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2009-0563

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 2026-06-16 62.83% 63.08% +0.25%
2 2026-06-15 79.92% 62.83% -17.09%
3 2026-02-28 — 79.92% —

Full EPSS history (38 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-0563

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
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-2009-0563

Affected software / configurations for CVE-2009-0563

Vendor Product Version Raw CPE
microsoft office 2000 cpe:2.3:a:microsoft:office:2000:sp3:*:*:*:*:*:*
microsoft office 2003 cpe:2.3:a:microsoft:office:2003:sp3:*:*:*:*:*:*
microsoft office 2004 cpe:2.3:a:microsoft:office:2004:*:*:*:*:macos:*:*
microsoft office 2007 cpe:2.3:a:microsoft:office:2007:sp1:*:*:*:*:*:*
microsoft office 2007 cpe:2.3:a:microsoft:office:2007:sp2:*:*:*:*:*:*
microsoft office 2008 cpe:2.3:a:microsoft:office:2008:*:*:*:*:macos:*:*
microsoft office xp cpe:2.3:a:microsoft:office:xp:sp3:*:*:*:*:*:*
microsoft office_compatibility_pack 2007 cpe:2.3:a:microsoft:office_compatibility_pack:2007:sp1:*:*:*:*:*:*
microsoft office_compatibility_pack 2007 cpe:2.3:a:microsoft:office_compatibility_pack:2007:sp2:*:*:*:*:*:*
microsoft office_word_viewer — cpe:2.3:a:microsoft:office_word_viewer:-:*:*:*:*:*:*:*
microsoft office_word_viewer 2003 cpe:2.3:a:microsoft:office_word_viewer:2003:sp3:*:*:*:*:*:*
microsoft open_xml_file_format_converter — cpe:2.3:a:microsoft:open_xml_file_format_converter:-:*:*:*:*:macos:*:*

References for CVE-2009-0563

URL Tags
http://osvdb.org/54959 Broken Link
http://www.securityfocus.com/archive/1/504204/100/0/threaded Broken Link Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/35188 Broken Link Third Party Advisory VDB Entry
http://www.securitytracker.com/id?1022356 Broken Link Third Party Advisory VDB Entry
http://www.us-cert.gov/cas/techalerts/TA09-160A.html Broken Link Third Party Advisory US Government Resource
http://www.vupen.com/english/advisories/2009/1546 Broken Link
http://www.zerodayinitiative.com/advisories/ZDI-09-035 Third Party Advisory VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-027 Patch Vendor Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6133 Broken Link
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-0563 US Government Resource
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