It was publicly documented by the people generating those codes this year.
It could have been discovered quite some time before that, and going by some tweets already posted (caveat: I've not verified anything here) some parts of it at least we're noticed, and Dell notified about them, in 2019.
It could have been discovered quite some time before that, and going by some tweets already posted (caveat: I've not verified anything here) some parts of it at least we're noticed, and Dell notified about them, in 2019.