PHP Other Vulnerability - CVE-2007-2727
The mcrypt_create_iv function in ext/mcrypt/mcrypt.c in PHP before 4.4.7 5.2.1 and possibly 5.0.x and other PHP 5 versions calls php_rand_r with an uninitialized seed variable and therefore always generates the same initialization vector (IV) which might allow context-dependent attackers to decrypt certain data more easily because of the guessable encryption keys.