A fourth lead change has happened at Lambeau.
Answering a 12-play drive by the Packers that resulted in a touchdown, the 49ers drove 63 yards in only four plays to take the lead again.
The score came via a 28-yard throw from quarterback Colin Kaepernick to tight end Vernon Davis, who had only one catch for nine yards before the touchdown.
Kaepernick added a 24-yard run during the drive, giving him 87 yards rushing for the day.