> MSV-4625: Mediatek Baseband Denial of Service During Parsing Invalid Accept header

An attacker sending a malformed SIP message over VoLTE to a device with a Mediatek baseband can trigger the vulnerability described here. The impact is DoS in the baseband, triggered by malformed VoLTE message such as SIP INVITE or MESSAGE request. The vulnerability described in this advisory affected a wide range of Mediatek devices. This vulnerability is assigned CVE-2025-20725. Vulnerability Details Crash happens due to a NULL access. sip_msg_content_type_compatible assumes a content type with a subcontenttype (e.g. text/plain), but inet_msg_unpack_content_type accepts a content type without a subcontenttype (e.g. text). bool sip_msg_content_type_compatible(char **accept,char **contentType) { int iVar1; char *pcVar2; char *pcVar3; iVar1 = voip_strcasecmp(accept[0],"*"); pcVar3 = "*"; // If the Accept is in format */something, accept anything, if the Accept is exactly */* if (iVar1 !