Which of the following is a serious vulnerability in the popular OpenSSL cryptographic software library? This weakness allows stealing the information protected, under normal conditions, by the…

The SSL/TLS Renegotiation Vulnerability (CVE-2009-3555) allowed man-in-the-middle injection of plaintext into renegotiated sessions, which is a different class of flaw unrelated to memory disclosure in OpenSSL.

Shellshock (CVE-2014-6271) is a remote code execution vulnerability in the GNU Bash shell triggered by specially crafted environment variables, and has no direct relation to OpenSSL or SSL/TLS.

The Heartbleed Bug is a buffer over-read vulnerability in OpenSSL's implementation of the TLS/DTLS heartbeat extension. An attacker could send a malformed heartbeat request that caused the server to return up to 64 KB of its own memory contents per request, potentially exposing private keys, session tokens, passwords, and other data that should be protected by SSL/TLS encryption - all without leaving a trace in server logs.

POODLE (CVE-2014-3566) is a protocol downgrade attack that exploits weaknesses in SSL 3.0's CBC padding, not a memory disclosure bug in the OpenSSL library itself.