Somebody managed to hack NASA a few months back — and the agency has no idea how.

“The ongoing investigation is a top agency priority, with senior leadership actively involved,” said Bob Gibbs, assistant administrator at the Office of the Chief Human Capital Officer, in a memo to employees on Tuesday.

“NASA does not believe that any Agency missions were jeopardized by the cyber incidents,” he added. “This message is being sent to all NASA employees for awareness, regardless of whether or not your information may have been compromised. Those NASA Civil Service employees who were on-boarded, separated from the agency, and/or transferred between Centers, from July 2006 to October 2018, may have been affected.”

Once identified, Gibbs said NASA plans to provide “specific follow-up information to those employees, past and present, whose PII [personally identifiable information] was affected, to include offering identity protection services and related resources, as appropriate.”

He told staff members that the agency’s cybersecurity team began investigating “a possible compromise” on Oct. 23 in servers where PII was stored.

“After initial analysis, NASA determined that information from one of the servers containing Social Security numbers and other PII data of current and former NASA employees may have been compromised,” Gibbs said. “Upon discovery of the incidents, NASA cybersecurity personnel took immediate action to secure the servers and the data contained within.”

Investigators have been examining the servers to determine the exact scope of the data breach and to possibly identify the people involved.

“This process will take time,” Gibbs said. “Our entire leadership team takes the protection of personal information very seriously. Information security remains a top priority for NASA. NASA is continuing its efforts to secure all servers, and is reviewing its processes and procedures to ensure that the latest security practices are being followed throughout the agency.”