TechMedia Network recently began notifying an undisclosed number of customers that their personal information may have been exposed when hackers breached the company's systems in October and November of 2013.

The data that may have been accessed includes the customers' names, mailing addresses, e-mail addresses, phone numbers, credit card numbers, expiration dates and CVV codes.

"We truly regret that this incident occurred and understand that it may cause you concern," TechMedia Director of eCommerce Greg Dalby wrote in the notification letter [PDF]. "We have taken many steps necessary to address the incident and are committed to fully protecting all of your personal information. Also, we took additional steps to prevent this type of incident from happening again, including implementing enhanced security measures."

According to to a company press release, customers who used a credit card to purchase TechMedia products or services between October 4, 2013 and November 20, 2013 may be affected.

"To protect against the possibility [of] fraud, we urge all of our customers to remain vigilant, to review credit card account statements and to monitor credit reports for any unauthorized activity," the company said in a statement. "In addition, do NOT respond to any requests for sensitive personal information in relation to this incident. TechMedia will never request such information via email or telephone unless it is absolutely necessary to respond directly to a customer regarding how this incident may have impacted them."

All those affected are being offered a free year of identity protection services from AllClear ID.

Customers with questions are advised to contact (866) 648-2140.

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