Jul 03, 2015

What does a SSLv3 error message in Firefox broswer mean?

Sometimes I get an error message telling me that I can’t connect to a website securely because of broken SSLv3 security protocol. What does this mean, and what is not secure about it? How serious of a security risk is this?
I see that you have a good answer already, but here's a link to the Firefox help page in case you need it later:

A year or so ago, a flaw was discovered in SSLv3 that would potentially allow for a man in the middle attack. Since the security protocol was no longer secure browsers, including Firefox, removed SSLv3 support. Since SSLv3 was obsolete (superseded by TSL) and primarily used by sites that had buggy HTTPS server, it wasn’t a big loss.

Here is what Mozilla says about SSLv3 and Firefox:
Starting with Firefox version 34, Firefox blocks Secure Sockets Layer version 3.0 (SSLv3) to protect your information from attacks. SSLv3 is a type of technology that some websites use to connect to a server. It is no longer secure, which makes it easy for hackers to extract your personal information during a connection.
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