Security News > 2015 > November > PSA: Signal for Android (replaced RedPhone+TextSecure yesterday) currently comments out ZRTP key continuity code. Verify the SAS at the start of every call! (Reddit)

Related vendor

VENDOR LAST 12M #/PRODUCTS LOW MEDIUM HIGH CRITICAL TOTAL VULNS
Signal 3 1 7 5 1 14
SAS 11 0 6 4 2 12