def decrypt_cbc(content, aes_key, iv):
    aescbc = Cipher(AES(aes_key), CBC(iv)).decryptor()
    padded_result = aescbc.update(content) + aescbc.finalize()
    unpadder = PKCS7(AES.block_size).unpadder()
    return unpadder.update(padded_result) + unpadder.finalize()