Depends on what you consider Fudging.
Any modification of a dice roll is fudging in my opinion.
So, there are several different types of fudging I do sometimes.
The first is that when PC's roll their HD, I let them keep re-rolling if they wish until the roll at least half the HD or higher (in otherwords, if it is a Wizard in 5e, they need to roll a 3 or higher for it to stand, unless they WANT to have a 1 or 2 that they roll as their HP addition for that level).
If the enemy has HP rolled, and they are one of the final bosses, and the players are killing them excessively fast, I MIGHT retroactively increase what was rolled for HP to make the fight a little longer. Vice Versa, if it is taking too long, I MIGHT retroactively decrease what was rolled to just get it over with.
If they have multiple attacks and I have a player being a snit, when I roll the various colored D20s, they don't know which atttack is which, I MIGHT switch up the D20s so one is for the attack that does more damage against the offending player.
If I have a player that is overly sensitive to death or dying, I MIGHT fudge the roll so that when they are hit, the damage doesn't put them out of the combat as quickly reducing damage so that they still have 1 or 2 hp at that point. I want to to retain players....so...if it would drive them off the game I try not to do that.
So, I might do little things like that. It depends on the game.