Very weak or denounced — not to be relied upon or attributed to the Prophet ﷺ with certainty.
It was narrated from Salim that his father said:“The Messenger of Allah (ﷺ) used to pray two Rak’ah while traveling, and he did not do more than that. And he used to pray Tahajjud at night.” I asked: “Did he pray Witr?” He said: “Yes.”