It pledged to provide an update late on 5 April about its efforts to fix the problem.

BBC: Sky customers complain after Yahoo email switch

The company said that problem, which lasted for about four hours, was caused by errors in a code update.

CNN: Dropbox investigating possible security breach

Update : CERT has now issued a warning about the issue here, and Cisco has acknowledged the problem as well.

FORBES: Disable This Buggy Feature On Your Router Now To Avoid A Serious Set Of Security Vulnerabilities