The twelve (12) times champions of the competition went to the Juventus Arena when the two sides met in the first leg of the tie and won by three goals to nothing.
However, the elation of the visitors was snapped in extra time as referee Michael Oliver deemed that Mehdi Banatia's contact on Lucas Vazquez inside the spot warranted a penalty - later converted by Madrid's Portuguese superstar.
Oliver sent off Buffon for his protests, meaning the goalkeeping great could only watch on as Cristiano Ronaldo slammed the decisive penalty past substitute Wojciech Szczesny.
However Zinedine Zidane's side were lucky to survive the scare as Ronaldo's penalty put an end to the contest.
'I don't understand why they are protesting, ' Ronaldo said after the game.
It was a penalty, they've told me it was a penalty.
Ranting and railing at the referee with such wild-eyed fury had to be punished with a red card, even if it was Buffon's first in 117 Champions League games and, quite possibly, his last.
The penalty's subsequent conversion by Actual's Cristiano Ronaldo - who, enjoying in his 150th Champions League sport, scored his tenth towards the Italian aspect - within the 98th minute was sufficient to see the Spanish giants via to the final spherical with an combination rating of 4-3.
Any player breaching UEFA protocol has previously been stung with a further ban, with Xabi Alonso being prevented from gracing the UEFA Super Cup in 2014 after breaking suspension regulations during the Champions League final earlier that year.
Then during Wednesday night's Champions League drama against Juventus at the Bernabeu, he showed a huge amount of composure in possession for large parts, and although he gave it away twice during promising counter attacks, Isco impressed for the majority.
Real Madrid are bidding to win the Champions League for the third season in a row.
"Between the first leg and this one, just about everything happened".
"Life goes on. I'm happy and proud of how we played, we made the impossible possible". I get indignant when they say it was a robbery.