ASL v4 uses FreeS/WAN version: super-freeswan-1.99.8 ASL v5 uses Openswan 1.0.7 ASL v6 uses Openswan version: 2.3.1
An up2date was just released for ASL v4. According to the Openswan website, ASL v5 shoud not be vulnerable since Openswan 1 is not. According to the above post, neither is ASL v6.