A DCSA bulletin described a ‘leaking’ sinkhole. Experts told CyberScoop they aren’t sure what that term means. (Getty Images) A Department of Defense bulletin on a ‘leaking’ sinkhole has baffled cybersecurity experts Sinkholes don't leak. So why does a small DOD agency say a Chinese hacking group is using one to steal data? May 6, 2020 By Shannon Vavra