The NSA has been hacking Huawei for years. If it had anything concrete, it would have shared it years ago rather than forcing its NATO allies to dump Huawei based on vagueries like "I know we wiretapped your chancellor, but trust us, Huawei is evil, we're just not going to prove it to you".
https://www.computerworld.com/article/2488962/nsa-hacked-int...