CSL DualCom GPRS CS2300-R devices with firmware 1.25 through 3.53 rely on a polyalphabetic substitution cipher with hardcoded keys, which m…

CSL DualCom GPRS CS2300-R devices with firmware 1.25 through 3.53 rely on a polyalphabetic substitution cipher with hardcoded keys, which makes it easier for remote attackers to defeat a cryptographic protection mechanism by capturing IP or V.22bis PSTN protocol traffic.