Unity browser crashes

Hi. We're trying to publish a web game, and the publisher has indicated that Unity has 8 vulnerabilities that can cause a browser crash. The catch is that it seems they're using a penetration testing tool that they will not release. They've given us the test script, but I'm not sure we can do anything with it.

I uploaded one of the test scripts here, and I'd really appreciate it if anyone can make any sense of it! I don't think we can work with this publisher unless we can get these vulnerabilities resolved. (To be clear, they said that the vulnerabilities are with the Unity engine, not with our game.) Thanks!

P.s., we're working with China's biggest web game publisher (www.pengyou.com), so these issues may hamper Unity adoption in China.