Which products and versions are affected by CVE-2011-1276?

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

Is CVE-2011-1276 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2011-1276 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-2011-1276?

Public exploit code is available.

Is there a fix for CVE-2011-1276?

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

How urgently should CVE-2011-1276 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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WatchlistCritical

CVE-2011-1276Excel Memory Corruption

Published Jun 16, 2011 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2011-1276 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Excel (Microsoft), Excel Viewer (Microsoft), Office (Microsoft) and 2 more products.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 28% 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 public exploit code exists for a high-severity flaw.

Scores

CVSS v2

9.3

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

EPSS (30-day exploit likelihood)

28%

Higher than 98.0% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

36/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Description

Buffer overflow in Microsoft Excel 2002 SP3, 2003 SP3, and 2007 SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Excel Viewer SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted Excel spreadsheet, related to improper validation of record information, aka "Excel Buffer Overrun Vulnerability."

Affected Products

8 affected entries in total

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

Timeline

Publicly disclosed
Jun 16, 2011
Last updated
Apr 28, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

FAQ

Common Questions.

Buffer overflow in Microsoft Excel 2002 SP3, 2003 SP3, and 2007 SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Excel Viewer SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2 allows remote attackers to execute arbitrary code or cause a denial of service…
Affected: Excel (Microsoft) versions 2002-sp3, 2003-sp3, 2007-sp2; Excel Viewer (Microsoft); Office (Microsoft) versions 2004, 2008, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2011-1276 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.