On Tuesday, March 3, 2015, researchers announced a new SSL/TLS vulnerability called the FREAK attack. It allows an attacker to intercept HTTPS connections between vulnerable clients and servers and force them to use weakened encryption, which the attacker can break to steal or manipulate sensitive data. This site is dedicated to tracking the impact of the attack and helping users test whether they’re vulnerable.
On Tuesday, October 14, 2014, Google released details on the POODLE attack, a padding oracle attack that targets CBC-mode ciphers in SSLv3. The vulnerability allows an active MITM attacker to decrypt content transferred an SSLv3 connection. While secure connections primarily use TLS (the successor to SSL), most users were vulnerable because web browsers and servers will downgrade to SSLv3 if there are problems negotiating a TLS session.
The Heartbleed Bug is a vulnerability in the OpenSSL cryptographic library that allows attackers to invisibly read sensitive data from a web server. This potentially includes cryptographic keys, usernames, and passwords. More information and frequently asked questions can be found in the initial disclosure.