http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2005-3694 Haven't checked whether this applies to 4.21.0, but Gentoo applies some patches to their 4.21.0 that "smell" like it: http://www.gentoo.org/cgi-bin/viewcvs.cgi/net-im/centericq/files/ More info and PoC for testing at https://bugs.gentoo.org/show_bug.cgi?id=100519
Thanks