Security experts are urging consumers to change their Web passwords after the recent disclosure of a vulnerability touching wide swaths of the Internet, even as Google Inc., Facebook Inc. and large banks said they weren't affected.

The flaw to OpenSSL, an open-source software that runs on as many as two-thirds of all active websites, was reported on April 7, by researchers who pushed out a fix. Dubbed Heartbleed, the bug could have allowed hackers to access encrypted e-mail messages, banking information, user names and passwords.

"The one saving grace with this flaw is that it was relatively simple to spot and as a result very simple to fix," Zully Ramzan, chief technology officer of Elastica, a cyber-security firm, wrote in an e-mail yesterday. "That said, OpenSSL is incredibly widespread. It's literally the most popular implementation of SSL on the planet. So any compromise in its security has far reaching implications."

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