Telecom and broadband provider Virgin Media (VMED) is telling over 800,000 customers with a particular router to change their passwords immediately after an investigation discovered hackers could gain access to it.

The risk is to customers with a Super Hub 2 router and the firm advised the owners to change both their network and router passwords if they were still using the default ones on the router's attached sticker.

The advisory follows an investigation that found hackers could access home networks and connected appliances in as little as four days.

"The security of our network and of our customers is of paramount importance to us. We continually upgrade our systems and equipment to ensure that we meet all current industry standards," a Virgin Media spokesman said.

What's Hot On TheStreet:

Well OK then, Jeff Immelt: General Electric's (GE) - Get Report outgoing CEO Jeff Immelt had some choice things to say at an event in NYC on Thursday night, TheStreet's Kinsey Grant reports. First, Immelt revealed a possibly fatal management mistake Kroger's(KR) - Get ReportCEO might have made about Amazon(AMZN) - Get Reportwho as we all know, just inked a $13.7 billion deal for organic grocer Whole Foods (WFM) . Immelt then took a jab at Hillary Clinton and Barack Obama for not visiting factories in their push to lift manufacturing wages. Talk about a well-paid boss going down swinging.

Why Sears Canada is dying: Sears Canada (SRSC) has one foot in the grave just like its ailing U.S. friend Sears Holdings Corp. (SHLD) . Unfortunately for Sears Canada, it's that friend across the boarder that has played a large role in its demise, TheStreet's Michelle Lodge reports. Sears has sucked badly needed cash away from Sears Canada through the years, leaving it unable to upgrade stores and do other things to compete effectively in the always challenging Canadian retail market.

General Electric is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells GE? Learn more now.

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Editors' pick: Originally published June 23.