{"cve":{"cve_id":"CVE-2009-3129","is_kev":true,"kev_date_added":"2022-03-03","kev_vendor_project":"Microsoft","kev_product":"Excel","kev_vulnerability_name":"Microsoft Excel Featheader Record Memory Corruption Vulnerability","kev_short_description":"Microsoft Office Excel allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset.","kev_required_action":"Apply updates per vendor instructions.","kev_due_date":"2022-03-24","kev_known_ransomware":false,"kev_notes":"https://nvd.nist.gov/vuln/detail/CVE-2009-3129","kev_cwes":["CWE-94"],"epss_score":0.85731,"epss_percentile":0.99695,"epss_as_of":"2026-06-23","description":"Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset, aka \"Excel Featheader Record Memory Corruption Vulnerability.\"","published_at":"2009-11-11T19:00:00Z","last_modified_at":"2026-06-16T23:11:00.237000Z","cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-787"],"nvd_references":["http://osvdb.org/59860","https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6521","http://www.securitytracker.com/id?1023157","http://www.securityfocus.com/bid/36945","http://www.us-cert.gov/cas/techalerts/TA09-314A.html","http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=832","https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-067","http://archives.neohapsis.com/archives/bugtraq/2009-11/0080.html","http://www.zerodayinitiative.com/advisories/ZDI-09-083","http://www.exploit-db.com/exploits/14706"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-28T23:05:08.744988Z"},"effective_severity":"HIGH","badges":["kev","epss"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack 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