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Former employee breaches

Is there any documented information or statistics that show the percentage of security incidents/hacks that are a result of actions of former employees whose access rights were not terminated?
According to PricewaterhouseCooper's global security survey, 13% of security breaches were by former employees, although the report does not specify the number of incidents where failure to terminate access rights was a factor.

A recent report on a U.K. bank found that 48% of employees who had been laid off were still able to access networks using their passwords. The report didn't say how long afterwards.

For more information on this topic, visit these other SearchSecurity.com resources:
News & Analysis: Destruction from the inside out
News & Analysis: Employees: Your best defense, or your greatest vulnerability?

This was last published in November 2001

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