<i>BN_mod_exp may produce incorrect results on x86_64 (CVE-2015-3193)</i><p>This one is absolutely terrifying.  There are common ways that TLS stacks break: Generally speaking, bugs in parsing certificates, bugs in the protocol handling, and side channel attacks on the cryptography.  These are risks which we aim to work around -- just like infections are a known complication of surgery, and antibiotic prophylaxis is recommended in some cases.<p>A bug which <i>results in multiplication producing the wrong answers</i> is in a completely different category.  This is a &quot;never event&quot;, akin to a surgical scalpel being left inside a patient after surgery or the wrong leg being amputated.