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critical
CVE exact
CVE_2009_3129
What it means
Excel FEATHEADER record declares an oversized/inconsistent internal length — the CVE-2009-3129 parser-overflow shape (legitimate records are only tens of bytes).
Why it fires
Microsoft Excel 2007/2003 SP1 FEATHEADER (Feature Header) parser uses an attacker-controlled cbHdrData length in a memcpy. A FEATHEADER record with an oversized record size or cbHdrData value is the documented exploit primitive — legitimate FEATHEADER records are tens of bytes. CVE-2009-3129 was actively exploited in targeted attacks to achieve code execution from crafted .xls files.
Other CVE heuristics
CVE_2026_34621_RELATED CVE_2023_26369 CVE_2026_34621 CVE_2010_1297_FLASH_RICHMEDIA CVE_2010_1297_SWF_TRIGGER CVE_2011_0611_SWF_TRIGGER CVE_2009_1862_FLASH_RICHMEDIA CVE_2010_2883 CVE_2018_4901 CVE_2009_3459 CVE_2018_4990_JPX_EMBEDDED_CMD CVE_2018_4990_JPX_CMAP_TRIGGER CVE_2010_1240 CVE_2010_0188 CVE_2014_0514 CVE_2013_3346 CVE_2013_0640 CVE_2010_3654_FLASH_RICHMEDIA CVE_2007_5020_MAILTO_MSHTA CVE_2014_0496 CVE_2008_2551 CVE_2021_40444 CVE_2006_4694 CVE_2008_0118