ColdFusion Server 4.5x: Using _range validation without both MIN and MAX values causes CF to crash
If you are validating data in form fields using the _range suffix and you do not specify both a MIN value and a MAX value, ColdFusion begins to throw errors and stops responding to requests. This has been logged as bug 23951. Here's a workaround:
ColdFusion Server 4.5x: Using _range validation without both MIN and MAX values causes CF to crash (Allaire/Macromedia Knowledge Base Article, March 30, 2001)