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.

Alcatel OmniSwitch 7700/7800 switches running AOS 5.1.1 contains a back door telnet server that was intended for development but not removed before distribution, which allows remote attackers to gain administrative privileges.

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.

Alcatel Speed Touch Home ADSL Modem allows remote attackers to cause a denial of service (reboot) via a network scan with unusual packets, such as nmap with OS detection.

Alcatel ADSL modems allow remote attackers to access the Trivial File Transfer Protocol (TFTP) to modify firmware and configuration via a bounce attack from a system on the local area network (LAN) side, which is allowed to access TFTP without authentication.

The challenge-response authentication of the EXPERT user for Alcatel Speed Touch running firmware KHDSAA.108 and KHDSAA.132 through KHDSAA.134 allows remote attackers to gain privileges by directly computing the response based on information that is provided by the device during login.

Alcatel Speed Touch running firmware KHDSAA.108 and KHDSAA.132 through KHDSAA.134 has a TFTP server running without a password, which allows remote attackers to change firmware versions or the device's configurations.