It could. But it's a CVE in the system that crashed or in the filesystem, not in the calculator web service that we were discussing. If a filesystem decides to use a bad online calculator for its internal logic, that's a vulnerability on the filesystem, not the calculator.
We aren't talking about a calculator web service though we are talking about the Linux kernel and if there's a bug in the kernel that could conceivably cause a crash in an otherwise correctly written application then that would be a CVE in the kernel.
