rsyslog before 7.6.6 and 8.x before 8.4.1 and sysklogd 1.5 and earlier allows remote attackers to cause a denial of service (crash), possibly execute arbitrary code, or have other unspecified impact via a crafted priority (PRI) value that triggers an out-of-bounds array access.
http://www.ubuntu.com/usn/USN-2381-1
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
http://www.openwall.com/lists/oss-security/2014/10/03/1
http://www.openwall.com/lists/oss-security/2014/09/30/15
http://www.mandriva.com/security/advisories?name=MDVSA-2015:130
http://www.debian.org/security/2014/dsa-3040
http://secunia.com/advisories/61930
http://secunia.com/advisories/61720
http://secunia.com/advisories/61494
http://rhn.redhat.com/errata/RHSA-2014-1671.html
http://rhn.redhat.com/errata/RHSA-2014-1654.html
http://rhn.redhat.com/errata/RHSA-2014-1397.html
http://lists.opensuse.org/opensuse-updates/2014-10/msg00021.html
http://lists.opensuse.org/opensuse-updates/2014-10/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00005.html