Inter's victory moved them level on points at the top with Lazio, heading into their derby against Milan on Saturday. Lazio and Inter have the same goal difference, but Inter have scored more.
Juventus failed to take advantage of Milan's slip when they lost 2-0 at Genoa and four-time champion Napoli won at Monza to leapfrog Juve in the standings.
Elsewhere on Thursday AEDT, Ballon D'Or winner Harry Kane received a guard of honour from his Bayern Munich teammates before a German Cup game but stayed on the bench.
In Italy, Matías Moreno put the ball into his own net in the 80th minute and fellow defender Redouane Halhal did the same two minutes later. Venezia's defeat was their eighth in nine games.
Belgian winger Samuel Mbangula, who started his career at Juventus, grabbed a hat-trick against Milan, who scored two early goals from Alphadjo Cissé.
Fifth-place Milan will have to defend better against Inter on Saturday, having led Bologna 2-1 up until the hour mark.
After Mbangula put the visitors ahead in the eighth minute, Cissé's brace put Milan up at the break. But Bartesaghi's own goal made it 2-2 and Mbangula did the rest.
Napoli were without suspended coach Massimiliano Allegri and moved level on points with Juve, but climbed above their rival and into sixth place on goal difference.
Denmark striker Rasmus Højlund, forward Matteo Politano, defender Rafa Marin, and former City standout Kevin De Bruyne each scored.
Genoa got first-half goals from defender Kingsley Ehizibue and forward Tommaso Baldanzi against Juve, who dropped to eighth spot.
Parma drew 0-0 with Udinese in a basement battle.
Kane waved to the crowd as he walked onto the field at Allianz Arena for the match against second-division Magdeburg.
Bayern won 6-1 with France star Michael Olise scoring twice.
Bayer Leverkusen rallied from two goals down to beat second-tier Nürnberg 5-2 at home with defender Edmond Tapsoba netting twice.
Freiburg beat Wolfsburg 3-2 thanks to a stoppage-time goal from Keisuke Goto and Germany forward Deniz Undav's 90th-minute winner earned Stuttgart a 1-0 win at Paderborn.
The Spanish soccer federation postponed all 24 Copa del Rey games scheduled for Wednesday because of a deadly train accident in central Spain.
