Gerd v. Egidy discovered that the Pluto IKE daemon in strongswan, an IPSec implementation for linux, is prone to a denial of service attack via a malicious packet. For the stable distribution , this problem has been fixed in version 4.2.4-5+lenny1. For the oldstable distribution , this problem has been fixed in version 2.8.0+dfsg-1+etch1. For the testing distribution and the unstable distribution , this problem will be fixed soon. We recommend that you upgrade your strongswan packages.