Multiple format string vulnerabilities in the ID Software Doom 3 engine as used by Doom 3 1.3.1 and earlier Quake 4 1.4.2 and earlier and Prey 1.3 and earlier when Punkbuster (PB) is enabled allow remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via format string specifiers in (1) a PB_Y packet to the YPG server or (2) a PB_U packet to UCON. NOTE: this issue might be in Punkbuster itself but there are insufficient details to be certain.