Which products and versions are affected by CVE-2009-0557?

Affected: Office (Microsoft) versions 2000-sp3, 2003-sp3, 2004, 2007-sp1, 2007-sp2, 2008, xp-sp3; Office Compatibility Pack (Microsoft) versions 2007-sp1, 2007-sp2; Office Excel Viewer (Microsoft) versions 2003-sp3, among others. The full list is in the CVE brief.

Is CVE-2009-0557 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 8, 2022.

Is CVE-2009-0557 in the CISA KEV catalog?

Yes. It was added on Jun 8, 2022 with a federal remediation due date of Jun 22, 2022.

Is there a public exploit for CVE-2009-0557?

Public exploit code is available.

Is there a fix for CVE-2009-0557?

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

How urgently should CVE-2009-0557 be patched?

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

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Vulnerability Intelligence

CVE-2009-0557

HighExploitedPublic exploit

Published Jun 10, 2009 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2009-0557 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Office (Microsoft), Office Compatibility Pack (Microsoft), Office Excel Viewer (Microsoft) and 2 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 8, 2022. Public exploit code is available.
EPSS estimates a 53% 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)

53%

Higher than 98.9% 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-2009-0557 brief as a PDF

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

Description

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; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allow remote attackers to execute arbitrary code via a crafted Excel file with a malformed record object, aka "Object Record Corruption Vulnerability."

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Jun 8, 2022	Jun 22, 2022	Not reported
Industry KEV feed	Jun 8, 2022	Jun 22, 2022	Not reported
CIRCL KEV	Jun 8, 2022	Jun 22, 2022	Not reported
ENISA EUVD	Jun 8, 2022	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

14 affected entries in total

Product	Affected versions	Fixed in
OfficeMicrosoft	2000-sp3, 2003-sp3, 2004, 2007-sp1, 2007-sp2, 2008, xp-sp3	n/a
Office Compatibility PackMicrosoft	2007-sp1, 2007-sp2	n/a
Office Excel ViewerMicrosoft	2003-sp3	n/a
Office Sharepoint ServerMicrosoft	2007-sp1, 2007-sp2	n/a
Open XML File Format ConverterMicrosoft	See advisory	n/a

Timeline

Publicly disclosed
Jun 10, 2009
Added to CISA KEV
Jun 8, 2022
Added to Industry KEV feed
Jun 8, 2022
Added to CIRCL KEV
Jun 8, 2022
Added to ENISA EUVD
Jun 8, 2022
Last updated
Apr 22, 2026

Weakness Type

CWE-94 Improper Control of Generation of Code ('Code Injection')

References

advisory35241
advisory1022351
advisoryTA09-160A
patchMS09-021
exploitVulnCheck exploitation report

4 more references in the full CVE brief

FAQ

Common Questions.

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; and Microsoft Office Compatibility Pack for Word, Excel…
Affected: Office (Microsoft) versions 2000-sp3, 2003-sp3, 2004, 2007-sp1, 2007-sp2, 2008, xp-sp3; Office Compatibility Pack (Microsoft) versions 2007-sp1, 2007-sp2; Office Excel Viewer (Microsoft) versions 2003-sp3, 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 Jun 8, 2022.
Yes. It was added on Jun 8, 2022 with a federal remediation due date of Jun 22, 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-2009-0557 Running On Your Attack Surface?

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