MOSCOW (Reuters) - Russia's top oil producer Rosneft (ROSN.MM) said on Tuesday its servers had been hit been a large-scale cyber attack, but its oil production was unaffected.

"The company's servers underwent a powerful hacking attack," the company said on Twitter. "The hacking attack could lead to serious consequences, but the company has moved to a reserve production processing system and neither oil output nor refining have been stopped."

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Rosneft's website was unavailable in Moscow as of 1250 GMT.

(Reporting by Polina Devitt, Jack Stubbs, Oksana Kobzeva; Editing by Christian Lowe)