openswan is vulnerable to remote code execution (RCE) attacks. The vulnerability exists through a buffer overflow issue in the atodn function in Openswan before 2.6.39, when Opportunistic Encryption is enabled and an RSA key is being used, allows remote attackers to cause a denial of service (pluto IKE daemon crash) and possibly execute arbitrary code via crafted DNS TXT records.
lists.opensuse.org/opensuse-security-announce/2013-07/msg00008.html
rhn.redhat.com/errata/RHSA-2013-0827.html
www.debian.org/security/2014/dsa-2893
www.securityfocus.com/bid/59838
access.redhat.com/errata/RHSA-2013:0827
access.redhat.com/security/cve/CVE-2013-2053
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=960229
lists.libreswan.org/pipermail/swan-announce/2013/000003.html
rhn.redhat.com/errata/RHSA-2013-0827.html
www.openswan.org/news/13