CVE-2021-26712
Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.
Date published : 2021-02-18
https://downloads.asterisk.org/pub/security/AST-2021-003.html