application.cgi in the Pingtel Xpressa handset running firmware 2.1.11.24 allows remote authenticated users to cause a denial of service (VxWorks OS crash) via a long HTTP GET request, possibly triggering a buffer overflow.

The web interface for Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 allows administrators to cause a denial of service by modifying the SIP_AUTHENTICATE_SCHEME value to force authentication of incoming calls, which does not notify the user when an authentication failure occurs.

Pingtel Xpressa 1.2.5 through 2.0.1 uses predictable (1) Call-ID, (2) CSeq, and (3) "To" and "From" SIP URL values in a Session Identification Protocol (SIP) request, which allows remote attackers to avoid registering with the SIP registrar.

Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 2.0.1 leaks sensitive information during boot-up, which allows attackers to obtain the MD5 hash of the Admin password, MD5 hash of the physical password, and other registration information.

Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 does not "time out" an inactive administrator session, which could allow other users to perform administrator actions if the administrator does not explicitly end the authentication.

Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 does not require administrative privileges to perform a firmware upgrade, which allows unauthorized users to upgrade the phone.

Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 allows attackers with physical access to restore the phone to factory defaults without authentication via a menu option, which sets the administrator password to null.

The web interface for Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 allows authenticated users to modify the Call Forwarding settings and hijack calls.

The web interface for Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 uses Base64 encoded usernames and passwords for HTTP basic authentication, which allows remote attackers to steal and easily decode the passwords via sniffing.

Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 downloads phone applications from a web site but can not verify the integrity of the applications, which could allow remote attackers to install Trojan horse applications via DNS spoofing.

Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 has a default null administrator password, which could allow remote attackers to gain access to the phone.

The enrollment process for Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 allows attackers with physical access to the phone to log out the current user and re-register the phone using MyPingtel Sign-In to gain remote access and perform unauthorized actions.