Several U.S. government agencies have been hit in a global hacking campaign that exploited a vulnerability in widely used software, the U.S. cyber watchdog agency said Thursday.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) said several federal agencies had experienced intrusions following the discovery of a weakness in the file transfer software MOVEit, Eric Goldstein, the agency's executive assistant director for cybersecurity, said in a statement.

"We are working urgently to understand impacts and ensure timely remediation," he said.

(With input from Reuters)