An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940. Reference: http://downloads.asterisk.org/pub/security/AST-2019-008.html https://seclists.org/fulldisclosure/2019/Nov/20
Created asterisk tracking bugs for this issue: Affects: epel-6 [bug 1801691]