Which products and versions are affected by CVE-2011-0105?

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

Is CVE-2011-0105 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Jul 19, 2023.

Is CVE-2011-0105 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-2011-0105?

Public exploit code is available.

Is there a fix for CVE-2011-0105?

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

How urgently should CVE-2011-0105 be patched?

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

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Vulnerability Intelligence

CVE-2011-0105

CriticalExploitedPublic exploit

Microsoft Excel 2002 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac obtain a certain length value from an uninitialized memory location, which allows remote attackers to trigger a buffer overflow and execute arbitrary code via a crafted Excel file,…

Published Apr 13, 2011 · Updated Apr 28, 2026

Key Facts

Patch immediately

CVE-2011-0105 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Excel (Microsoft), Office (Microsoft), Open XML File Format Converter (Microsoft).
It is exploited in the wild, listed in Industry KEV feed since Jul 19, 2023. Public exploit code is available.
EPSS estimates a 70% 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 v2

9.3

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

EPSS (30-day exploit likelihood)

70%

Higher than 99.3% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2011-0105 brief as a PDF

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

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Jul 19, 2023	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

4 affected entries in total

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

Timeline

Publicly disclosed
Apr 13, 2011
Added to Industry KEV feed
Jul 19, 2023
Last updated
Apr 28, 2026

Weakness Type

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

References

4 more references in the full CVE brief

FAQ

Common Questions.

Microsoft Excel 2002 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac obtain a certain length value from an uninitialized memory location, which allows remote attackers to trigger a buffer overflow and execute arbitrary code via a crafted Excel file, aka "Excel Data Initialization Vulnerab…
Affected: Excel (Microsoft) versions 2002-sp3; Office (Microsoft) versions 2004, 2008; Open XML File Format Converter (Microsoft). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jul 19, 2023.
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 listed as exploited in the wild.

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