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LIBSNDFILE.DLL, as used by AOL Nullsoft Winamp 5.33 and possibly other products, allows remote attackers to execute arbitrary code via a crafted .MAT file that contains a value that is used as an offset, which triggers memory corruption.
Use Nullsoft vendor hub and Winamp product page to widen CVE-2007-1921 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2011-4857, CVE-2011-3834 and CVE-2010-4372 for nearby disclosures in the same product family.