How severe is CVE-2010-0263?

CVE-2010-0263 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2010-0263 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-0263?

CVE-2010-0263 primarily affects Microsoft Excel. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-0263?

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-2010-0263 published?

CVE-2010-0263 was published on 2010-03-10 and last updated on 2026-06-16.

CVE-2010-0263

CVE-2010-0263 is a critical-severity vulnerability in Microsoft Excel with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Microsoft Excel
Published: 2010-03-10
Last modified: 2026-06-16

Description

Microsoft Office Excel 2007 SP1 and SP2; Office 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer SP1 and SP2; Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2; and Office SharePoint Server 2007 SP1 and SP2 do not validate ZIP headers during decompression of Open XML (.XLSX) documents, which allows remote attackers to execute arbitrary code via a crafted document that triggers access to uninitialized memory locations, aka "Microsoft Office Excel XLSX File Parsing Code Execution Vulnerability."

Frequently asked questions

What is CVE-2010-0263?: Microsoft Office Excel 2007 SP1 and SP2; Office 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer SP1 and SP2; Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2; and Office SharePoint Server 2007 SP1 and SP2 do not validate ZIP headers during decompression of Open XML (.XLSX) documents, which allows remote attackers to execute arbitrary code via a crafted document that triggers access to uninitialized memory locations, aka "Microsoft Office Excel XLSX File Parsing Code Execution Vulnerability."
How severe is CVE-2010-0263?: CVE-2010-0263 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2010-0263 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-0263?: CVE-2010-0263 primarily affects Microsoft Excel. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-0263?: 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-2010-0263 published?: CVE-2010-0263 was published on 2010-03-10 and last updated on 2026-06-16.

References

Affected products (15)

cpe:2.3:a:microsoft:excel:2002:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2003:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2007:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2007:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:office:2004:*:mac:*:*:*:*:*
cpe:2.3:a:microsoft:office:2008:*:mac:*:*:*:*:*
cpe:2.3:a:microsoft:office_compatibility_pack:2007:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_compatibility_pack:2007:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_excel_viewer:*:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_excel_viewer:*:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp1:x32:*:*:*:*:*
cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp1:x64:*:*:*:*:*
cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp2:x32:*:*:*:*:*
cpe:2.3:a:microsoft:office_sharepoint_server:2007:sp2:x64:*:*:*:*:*
cpe:2.3:a:microsoft:open_xml_file_format_converter:*:*:mac:*:*:*:*:*

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