Multiple stack-based buffer overflows in Tumbleweed Email Firewall (EMF) allow remote attackers to execute arbitrary code via an email attachment with an LHA archive that contains a (1) file or (2) directory with a long LHA extended header, (3) an LHA archive in which the "temporary pathname" field for decompressed output is greater than 2 bytes, or (4) an LHA archive with a long filename.