LanHelper v1.74 is vulnerable to a denial of service attack due to a local buffer overflow. An attacker can exploit this vulnerability by running LanHelper.exe, copying the content of LanHelper_Crash.txt or 6000 'A' characters to the clipboard, going to 'NT-Utilities' - 'Form Send Message' - 'Message' - 'Add' - 'Add target' and pasting the result from the python script, and then pasting the result from the python script in 'Message text:'. Clicking the 'Send' button will cause a crash.