CVE:CVE-2016-9963
CNNVD:CNNVD-201612-575
Exim是英国剑桥大学开发的一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。
Exim 4.87.1之前的版本存在安全漏洞。远程攻击者可利用该漏洞获取私有的DKIM签名密钥。
solution:Upgrade exim exim to a higher version than 4.87,and avoid the version (,4.87]; Upgrade canonical ubuntu_linux to a higher version than 12.04,14.04,16.04,16.10,and avoid the version 12.04,14.04,16.04,16.10; Upgrade debian debian_linux to a higher version than 8.0,and avoid the version 8.0