1. Hackers roamed Nortel’s network for years without detection
    Tom Warren, theverge.com

    Brian Shields, a former systems security advisor for Nortel, led an internal investigation on the breach and exposed rootkit software on at least two machines in 2009 that allowed hackers to control them remotely and monitor email. Despite the original discovery in 2004 and the subsequent investigation that led to the rootkit detection in 2009, Nortel allegedly ignored the problem and failed to disclose it to potential buyers of business.