CVE:CVE-2021-26712
CNNVD:CNNVD-202102-1374
Sangoma Technologies Asterisk是加拿大Sangoma Technologies公司的一套开源电话交换机（PBX）系统软件。该软件支持语音信箱、多方语音会议、交互式语音应答(IVR)等。
Sangoma Asterisk 中存在安全漏洞。该漏洞源于允许未经身份验证的远程攻击者通过重播SRTP数据包提前终止安全调用。以下产品及版本受到影响：Sangoma Asterisk 13.38.1, Sangoma Asterisk 16.16.0, Sangoma Asterisk 17.9.1, Sangoma Asterisk 18.2.0, Certified Asterisk 16.8-cert5。
solution:Upgrade digium asterisk to a higher version than 13.38.2,16.16.1,17.9.2,18.2.1,and avoid the version [13.0.0,13.38.2],[16.0.0,16.16.1),[17.0.0,17.9.2),[18.0,18.2.1); Upgrade digium certified_asterisk to a higher version than 16.8,16.8:cert1-rc1,16.8:cert1-rc2,16.8:cert1-rc3,16.8:cert1-rc4,16.8:cert2,16.8:cert3,16.8:cert4,16.8:cert4-rc1,16.8:cert4-rc2,16.8:cert4-rc3,16.8:cert4-rc4,16.8:cert5,and avoid the version 16.8,16.8:cert1-rc1,16.8:cert1-rc2,16.8:cert1-rc3,16.8:cert1-rc4,16.8:cert2,16.8:cert3,16.8:cert4,16.8:cert4-rc1,16.8:cert4-rc2,16.8:cert4-rc3,16.8:cert4-rc4,16.8:cert5