Which products and versions are affected by CVE-2009-3126?

Affected: Excel Viewer (Microsoft) versions 2003, 2003-sp3; Expression Web (Microsoft) versions 2; Forefront Client Security (Microsoft) versions 1.0, among others. The full list is in the CVE brief.

Is CVE-2009-3126 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012.

Is CVE-2009-3126 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2009-3126?

No public exploit code is known.

Is there a fix for CVE-2009-3126?

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

How urgently should CVE-2009-3126 be patched?

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

Request A Demo

On CISA KEVCritical

CVE-2009-3126Excel Viewer Vulnerability

Published Oct 14, 2009 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2009-3126 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Excel Viewer (Microsoft), Expression Web (Microsoft), Forefront Client Security (Microsoft) and 22 more products.
It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012. No public exploit code is known.
EPSS estimates a 23% 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.

Scores

CVSS v2

9.3

AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

23%

Higher than 97.7% of all scored CVEs

Exploit maturity

Exploited (KEV)

ATLAS score

47/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Oct 18, 2012

1100 days after publication

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Exploited (KEV)

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Description

Integer overflow in GDI+ in Microsoft Internet Explorer 6 SP1, Windows XP SP2 and SP3, Office XP SP3, Office 2003 SP3, 2007 Microsoft Office System SP1 and SP2, Office Project 2002 SP1, Visio 2002 SP2, Office Word Viewer, Word Viewer 2003 Gold and SP3, Office Excel Viewer 2003 Gold and SP3, Office Excel Viewer, Office PowerPoint Viewer 2007 Gold, SP1, and SP2, Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2, Expression Web, Expression Web 2, Groove 2007 Gold and SP1, Works 8.5, SQL Server 2000 Reporting Services SP2, SQL Server 2005 SP2 and SP3, Report Viewer 2005 SP1, Report Viewer 2008 Gold and SP1, and Forefront Client Security 1.0 allows remote attackers to execute arbitrary code via a crafted PNG image file, aka "GDI+ PNG Integer Overflow Vulnerability."

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Oct 18, 2012	n/a	Not reported

Affected Products

56 affected entries in total

Product	Affected versions	Fixed in
Excel ViewerMicrosoft	2003, 2003-sp3	n/a
Expression WebMicrosoft	2	n/a
Forefront Client SecurityMicrosoft	1.0	n/a
Internet ExplorerMicrosoft	6-sp1	n/a
.net FrameworkMicrosoft	1.1-sp1, 2.0-sp1, 2.0-sp2	n/a

20 more affected products in the full CVE brief

Timeline

Publicly disclosed
Oct 14, 2009
Added to Industry KEV feed
Oct 18, 2012
Last updated
Apr 22, 2026

Weakness Type

CWE-189

References

FAQ

Common Questions.

Integer overflow in GDI+ in Microsoft Internet Explorer 6 SP1, Windows XP SP2 and SP3, Office XP SP3, Office 2003 SP3, 2007 Microsoft Office System SP1 and SP2, Office Project 2002 SP1, Visio 2002 SP2, Office Word Viewer, Word Viewer 2003 Gold and SP3, Office Excel Viewer 2003 Gold and SP3, Office Excel Viewer, Office…
Affected: Excel Viewer (Microsoft) versions 2003, 2003-sp3; Expression Web (Microsoft) versions 2; Forefront Client Security (Microsoft) versions 1.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
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-2009-3126 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.