The average zero-day (0day) bug has a lifespan of 348 days before it is discovered or patched, and some vulnerabilities live on for much longer, according to security vendor Immunity Inc.’s chief executive officer.

Zero-day bugs are vulnerabilities that have not been patched or made public. When discovered and not disclosed, these bugs can be used by hackers and criminals to break into corporate systems to steal or change data. As a result, there is a thriving market for zero-day bugs.

“Huge amounts of money are being offering to zero-day discoverers for their zero-days,” said Justine Aitel, Immunity’s CEO, speaking in Singapore at the SyScan ’07 security conference.

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