The Session Initiation Protocol (SIP) implementation in Alcatel OmniPCX Enterprise 5.0 Lx allows remote attackers to cause a denial of service and possibly execute arbitrary code via crafted INVITE messages, as demonstrated by the OUSPG PROTOS c07-sip test suite.

Alcatel OmniPCX 4400 installs known user accounts and passwords in the /etc/password file by default, which allows remote attackers to gain unauthorized access.

FTP service in Alcatel OmniPCX 4400 allows the "halt" user to gain root privileges by modifying root's .profile file.

Alcatel 4400 installs the /chetc/shutdown command with setgid privileges, which allows many different local users to shut down the system.

Alcatel OmniPCX 4400 installs files with world-writable permissions, which allows local users to reconfigure the system and possibly gain privileges.