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.
| Software | From | Fixed in |
|---|---|---|
| pingtel / xpressa | 1.2.7.4 | 1.2.7.4.x |
| pingtel / xpressa | 1.2.5 | 1.2.5.x |