Two vulnerabilities were fixed in Openswan, an IKE/IPsec implementation for Linux. CVE-2013-2053 During an audit of Libreswan , Florian Weimer found a remote buffer overflow in the atodn function. This vulnerability can be triggered when Opportunistic Encryption is enabled and an attacker controls the PTR record of a peer IP address. Authentication is not needed to trigger the vulnerability. CVE-2013-6466 Iustina Melinte found a vulnerability in Libreswan which also applies to the Openswan code. By carefully crafting IKEv2 packets, an attacker can make the pluto daemon dereferences non-received IKEv2 payload, leading to the daemon crash. Authentication is not needed to trigger the vulnerability. Patches were originally written to fix the vulnerabilities in Libreswan, and have been ported to Openswan by Paul Wouters from the Libreswan Project. Since the Openswan package is not maintained anymore in the Debian distribution and is not available in testing and unstable suites, it is recommended for IKE/IPsec users to switch to a supported implementation like strongSwan.