Multiple unspecified vulnerabilities in Ethereal 0.10.x up to 0.10.14 allow remote attackers to cause a denial of service (crash from null dereference) via (1) multiple vectors in H.248, and the (2) X.509if, (3) SRVLOC, (4) H.245, (5) AIM, and (6) general packet dissectors; and (7) the statistics counter.