CVE:CVE-2021-20221
CNNVD:CNNVD-202102-357
QEMU（Quick Emulator）是法国法布里斯-贝拉（Fabrice Bellard）个人开发者的一套模拟处理器软件。该软件具有速度快、跨平台等特点。
QEMU 4.2.0版本存在缓冲区错误漏洞。攻击者利用该漏洞导致系统拒绝服务。
solution:Upgrade qemu qemu to a higher version than 4.2.0,and avoid the version (,4.2.0]; Upgrade redhat enterprise_linux to a higher version than 8.0,and avoid the version 8.0; Upgrade debian debian_linux to a higher version than 9.0,10.0,and avoid the version 9.0,10.0