Not immediately. But further down the line of Cummings revelations, if more are coming, perhaps. If something unforeseen happens in the Covid battle, or if the economy fails to achieve a smooth recovery, then yes, he is vulnerable. The thing to remember about Boris is that the thing he is best at is winning.
He won, against predictions, the Brexit referendum, he eventually won the Tory leadership battle and he won spectacularly the 2019 general election. He is way ahead in the polls and the vaccination programme is among the most successful public projects ever undertaken. The economic support package, although not perfect, is one of the most generous in the world. There is nobody else in the current cabinet who could give the Tories the can do, go get image that goes with Boris.
Nevertheless he is not in the clear. Cummings, although hated by more than he is loved, with his own reputation for honesty and integrity battered by a combination of his Brexit slogans and lockdown lies, remains a formidable force, especially because he has copies of everything that can do harm to his former friend and boss, which he has promised to use to make his case. That case is not a gentle nudge to do better. It is a massive shove to exit Number Ten. On the grounds that the prime minister is incompetent, untrustworthy and a political sleazebag.
So if fights to the finish are your favourite stuff to watch, then you are in for some fun. Because Cummings is determined to destroy Boris. And it may be that in the end the only way open to Boris to stop his former right hand man from succeeding, is for Boris to destroy Cummings first.