CVE-2011-1987
CVE-2011-1987 is a critical-severity vulnerability in Microsoft Excel with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 20% places it in the 97th 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: 20% (97th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Microsoft Excel
- Published:
- Last modified:
Description
Array index error in Microsoft Excel 2003 SP3 and 2007 SP2; Excel in Office 2007 SP2; Excel 2010 Gold and SP1; Excel in Office 2010 Gold and SP1; Office 2004, 2008, and 2011 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 via a crafted spreadsheet, aka "Excel Out of Bounds Array Indexing Vulnerability."
Frequently asked questions
- What is CVE-2011-1987?
- Array index error in Microsoft Excel 2003 SP3 and 2007 SP2; Excel in Office 2007 SP2; Excel 2010 Gold and SP1; Excel in Office 2010 Gold and SP1; Office 2004, 2008, and 2011 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 via a crafted spreadsheet, aka "Excel Out of Bounds Array Indexing Vulnerability."
- How severe is CVE-2011-1987?
- CVE-2011-1987 has a CVSS 2.0 base score of 9.3, rated critical severity.
- Is CVE-2011-1987 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2011-1987?
- CVE-2011-1987 primarily affects Microsoft Excel. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2011-1987?
- 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-2011-1987 published?
- CVE-2011-1987 was published on 2011-09-15 and last updated on 2026-06-16.
References
- http://www.us-cert.gov/cas/techalerts/TA11-256A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-072
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12953
Affected products (17)
- cpe:2.3:a:microsoft:excel:2003:sp3:*:*:*:*:*:*
- cpe:2.3:a:microsoft:excel:2007:sp2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:excel:2010:*:x32:*:*:*:*:*
- cpe:2.3:a:microsoft:excel:2010:*:x64:*:*:*:*:*
- cpe:2.3:a:microsoft:excel:2010:sp1:x32:*:*:*:*:*
- cpe:2.3:a:microsoft:excel:2010:sp1:x64:*:*:*:*:*
- cpe:2.3:a:microsoft:excel_viewer:*:sp2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2004:*:mac:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2007:sp2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2008:*:mac:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2010:*:x32:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2010:*:x64:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2010:sp1:x32:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2010:sp1:x64:*:*:*:*:*
- cpe:2.3:a:microsoft:office:2011:*:mac:*:*:*:*:*
- cpe:2.3:a:microsoft:office_compatibility_pack:2007:sp2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:open_xml_file_format_converter:*:*:mac:*:*:*:*:*
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