Thousands of people complained about Janet Jackson's exposure
The US broadcast regulatory agency has asked the country's top court to review the indecency case over Janet Jackson's "wardrobe malfunction" in 2004.
The singer exposed her right breast during the Super Bowl half-time show.
The Federal Communications Commission said that the US Circuit Court of Appeals incorrectly applied a rule to say that CBS were not responsible.
It now wants the US Supreme Court to force the TV network to pay the $550,000 (£371,296) fine.
A Philadelphia court ruled in July that CBS would not have pay the fine after the US Circuit Court of Appeals ruled that CBS were not responsible for the incident.
The FCC said the court incorrectly applied a rule - which has since changed - regarding expletives that required a profanity be repeated before it is deemed indecent.
The FCC contends that the rule did not apply to images.
At the time, broadcasters did not employ a video delay for live events, a practice that changed within a week of the game.
The incident generated a record number of complaints - more than 500,000 - and CBS was quick to apologise.
Justin Timberlake, who was performing with Jackson at the time, blamed the exposure on a "wardrobe malfunction", while Jackson said it had been an accident.