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 SSL/TL

The Heartbleed Bug (CVE-2014-0160) is a vulnerability in OpenSSL's implementation of the TLS/DTLS heartbeat extension that allows an attacker to read up to 64KB of arbitrary server memory per request. This exposes private keys, session tokens, and plaintext credentials without authentication or any trace in server logs.

POODLE (Padding Oracle On Downgraded Legacy Encryption) exploits a weakness in SSL 3.0 CBC padding to decrypt ciphertext, which is a protocol-level attack unrelated to the OpenSSL heartbeat implementation.

The SSL/TLS Renegotiation Vulnerability (CVE-2009-3555) allows attackers to inject plaintext into an established encrypted session during renegotiation, which is a separate protocol flaw with no connection to OpenSSL's heartbeat extension.

Shellshock (CVE-2014-6271) is a remote code execution vulnerability in the GNU Bash shell that allows arbitrary command injection via environment variables, and is not related to OpenSSL or cryptographic libraries.