Cipher suites that use CBC (Cipher Block Chaining), such as TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 and TLS_RSA_WITH_AES_128_CBC_SHA, are vulnerable to padding oracle and related attacks. Removing CBC-based ciphers ensures only modern and secure cipher suites (e.g., GCM, ChaCha20) are used, remediating the vulnerability.