isakmpd, OpenBSD’s IKE daemon, contains severe flaws in payload handling that allow for the unauthorized deletion of IKE and IPsec SAs. It allows this due to a lack of encryption being applied in Quick Mode and a lack of validation for the origin of delete message payloads, among other issues.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/32135/isakmpd.txt
Source: https://packetstormsecurity.com/files/32135/isakmpd.txt.html