Buffer overflow in the atodn function in strongSwan 2.0.0 through 4.3.4, 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. NOTE: this might be the same vulnerability as CVE-2013-2053 and CVE-2013-2054.
https://lists.libreswan.org/pipermail/swan-announce/2013/000003.html
http://www.securityfocus.com/bid/59837
http://download.strongswan.org/security/CVE-2013-2054/CVE-2013-2054.txt