Which products and versions are affected by CVE-2011-0104?

Affected: Excel (Microsoft) versions 2002-sp3, 2003-sp3; Office (Microsoft) versions 2004, 2008; Open XML File Format Converter (Microsoft). The full list is in the CVE brief.

Is CVE-2011-0104 being exploited in the wild?

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

Is CVE-2011-0104 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-2011-0104?

Public exploit code is available.

Is there a fix for CVE-2011-0104?

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

How urgently should CVE-2011-0104 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2011-0104

CriticalPublic exploit

Microsoft Excel 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted HLink record in an Excel file, aka "Excel Buffer…

Published Apr 13, 2011 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2011-0104 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Excel (Microsoft), Office (Microsoft), Open XML File Format Converter (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. 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 very likely to be exploited soon.

CVSS v2

9.3

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

EPSS (30-day exploit likelihood)

53%

Higher than 98.9% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2011-0104 brief as a PDF

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

Description

Affected Products

5 affected entries in total

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

Timeline

Publicly disclosed
Apr 13, 2011
Last updated
Apr 28, 2026

Weakness Type

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

References

advisory39122
advisoryADV-2011-0940
exploitExploitDB-35573
other71761
otherMS11-021

5 more references in the full CVE brief

FAQ

Common Questions.

Microsoft Excel 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted HLink record in an Excel file, aka "Excel Buffer Overwrite Vulnerability."
Affected: Excel (Microsoft) versions 2002-sp3, 2003-sp3; Office (Microsoft) versions 2004, 2008; Open XML File Format Converter (Microsoft). 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 it is very likely to be exploited soon.

Is CVE-2011-0104 Running On Your Attack Surface?

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