OH Yes! 100% this. The JVM itself is a huge, sprawling beast. Adding in an extra 1000 libraries makes that surface area 1000 times worse. There is probably a w

OH Yes! 100% this. The JVM itself is a huge, sprawling beast. Adding in an extra 1000 libraries makes that surface area 1000 times worse. There is probably a way to exfiltrate a list of loaded classes via the exploit. (I can't think of one, but I believe there's a good chance such a thing exists). You could also just try looking for one of the zillion known bad classes. I wanted to highlight that you're really looking at a multi stage attack for RCE. DOS is trivial. Use all the memory, Make a zillion threads, force load libraries that don't exist. I'm only vaguely competent, and I'm pretty sure I can make that happen in half an hour. A full RCE is less, somehow. I can't quite express the difference in risk. As a half assed attempt, I could show a 14 year old how to take down a server in an hour or two, and as I said, I'm only vaguely competent. If you're looking for a full RCE, that would take me time. But over a week or two, I could probably figure it out and be able to explain it. URL class loader seems like a promising vector. jars have static initializers as part of the manifest, I think I could put that together, eventually. And I suck. The risk is still huge. But like, bob's java shop isn't a target for the equation group. They probably have a day or two to figure it out and fix RCE issues. DOS issues, they're fucked. That's trivial.