Stack-based buffer overflow in BreakPoint Software Hex Workshop 4.23, 6.0.1.4603, and other 6.x and earlier versions allows remote attackers to execute arbitrary code via a crafted Intel Hex Code (.hex) file. NOTE: some of these details are obtained from third party information.

More... (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-0812)