Buffer overflow in the atodn function in libreswan 3.0 and 3.1 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.