Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.0.14 and 3.5.x before 3.5.3 Thunderbird before 2.0.0.24 and SeaMonkey before 1.1.19 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors related to the BinHex decoder in netwerk/streamconv/converters/nsBinHexDecoder.cpp and unknown vectors.