Cisco Systems is resetting the passwords of registered members of its Web site after discovering a flaw in its internal search tool that could have exposed them.

John Noh, a Cisco spokesman, said the password reset, which was initiated Monday after testing the vulnerability's veracity, was a precautionary measure to ensure users' safety.

He added the company doesn't believe any sensitive information was compromised.

Noh wouldn't say how many registered users the site hosts but said the vulnerability affected employees, business partners and third-party users. He said the company has reset the passwords for everyone, but is still in the process of resetting them for third-party users.

''This was a vulnerability that impacted an internal search tool on,'' he said. ''It was a security research organization that brought it to our attention and we fixed it immediately.''

He declined to comment on the details of the vulnerability, but said the security firm that tipped them off in the first place did not want its name publicized.

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