Which products and versions are affected by CVE-2009-3129?

Affected: Excel (Microsoft) versions 2002-sp3, 2003-sp3, 2007-sp1, 2007-sp2; Excel Viewer (Microsoft) versions 2003-sp3; Office (Microsoft) versions 2004, 2008, among others. The full list is in the CVE brief.

Is CVE-2009-3129 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 1, 2012.

Is CVE-2009-3129 in the CISA KEV catalog?

Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 24, 2022.

Is there a public exploit for CVE-2009-3129?

Public exploit code is available.

Is there a fix for CVE-2009-3129?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2009-3129 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Request A Demo

Vulnerability Intelligence

CVE-2009-3129

HighExploitedPublic exploit

Published Nov 11, 2009 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2009-3129 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Excel (Microsoft), Excel Viewer (Microsoft), Office (Microsoft) and 1 more product.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 1, 2012. Public exploit code is available.
EPSS estimates a 84% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.8

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

84%

Higher than 99.6% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2009-3129 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset, aka "Excel Featheader Record Memory Corruption Vulnerability."

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Mar 3, 2022	Mar 24, 2022	Not reported
Industry KEV feed	Jan 1, 2012	Mar 24, 2022	Not reported
CIRCL KEV	Mar 3, 2022	Mar 24, 2022	Not reported
ENISA EUVD	Mar 3, 2022	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

10 affected entries in total

Product	Affected versions	Fixed in
ExcelMicrosoft	2002-sp3, 2003-sp3, 2007-sp1, 2007-sp2	n/a
Excel ViewerMicrosoft	2003-sp3	n/a
OfficeMicrosoft	2004, 2008	n/a
Open XML File Format ConverterMicrosoft	See advisory	n/a

Timeline

Publicly disclosed
Nov 11, 2009
Added to Industry KEV feed
Jan 1, 2012
Added to CISA KEV
Mar 3, 2022
Added to CIRCL KEV
Mar 3, 2022
Added to ENISA EUVD
Mar 3, 2022
Last updated
Apr 22, 2026

Weakness Type

CWE-787 Out-of-bounds Write

References

advisory36945
advisory1023157
advisoryTA09-314A
advisoryhttp://www.zerodayinitiative.com/advisories/ZDI-09-083
patchMS09-067

15 more references in the full CVE brief

FAQ

Common Questions.

Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows remote attackers to ex…
Affected: Excel (Microsoft) versions 2002-sp3, 2003-sp3, 2007-sp1, 2007-sp2; Excel Viewer (Microsoft) versions 2003-sp3; Office (Microsoft) versions 2004, 2008, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 1, 2012.
Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 24, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2009-3129 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.