How severe is CVE-2011-0105?

CVE-2011-0105 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-0105 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 71% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0105?

CVE-2011-0105 primarily affects Microsoft Excel. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-0105?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-0105 published?

CVE-2011-0105 was published on 2011-04-13 and last updated on 2026-06-16.

CVE-2011-0105

CVE-2011-0105 is a critical-severity vulnerability in Microsoft Excel with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 71% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 71% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Excel
Published: 2011-04-13
Last modified: 2026-06-16

Description

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 Vulnerability."

Frequently asked questions

What is CVE-2011-0105?: 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 Vulnerability."
How severe is CVE-2011-0105?: CVE-2011-0105 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-0105 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 71% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0105?: CVE-2011-0105 primarily affects Microsoft Excel. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0105?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-0105 published?: CVE-2011-0105 was published on 2011-04-13 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:microsoft:excel:2002:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office:2004:*:mac:*:*:*:*:*
cpe:2.3:a:microsoft:office:2008:*:mac:*:*:*:*:*
cpe:2.3:a:microsoft:open_xml_file_format_converter:*:*:mac:*:*:*:*:*

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