CVE:CVE-2016-1840
CNNVD:CNNVD-201605-478
Apple iOS、watchOS、OS X El Capitan和tvOS都是美国苹果（Apple）公司的产品。Apple iOS是为移动设备所开发的一套操作系统；watchOS是一套智能手表操作系统；OS X El Capitan是为Mac计算机所开发的一套专用操作系统；tvOS是一套智能电视操作系统。Libxml2是GNOME项目组所研发的一个基于C语言的用来解析XML文档的函数库，它支持多种编码格式、Xpath解析、Well-formed和valid验证等。
Apple iOS 9.3.2之前版本、watchOS 2.2.1之前版本、OS X El Capitan 10.11.5之前版本和tvOS 9.2.1之前版本的libxml2中存在安全漏洞。远程攻击者可借助特制的XML利用该漏洞造成拒绝服务（内存损坏）或执行任意代码。
solution:Upgrade debian debian_linux to a higher version than 8.0,and avoid the version 8.0; Upgrade apple iphone_os to a higher version than 9.3.2,and avoid the version (,9.3.2); Upgrade apple mac_os_x to a higher version than 10.11.5,and avoid the version (,10.11.5); Upgrade apple tvos to a higher version than 9.2.1,and avoid the version (,9.2.1); Upgrade apple watchos to a higher version than 2.2.1,and avoid the version (,2.2.1); Upgrade canonical ubuntu_linux to a higher version than 12.04,14.04,15.10,16.04,and avoid the version 12.04,14.04,15.10,16.04; Upgrade redhat enterprise_linux_desktop to a higher version than 6.0,7.0,and avoid the version 6.0,7.0; Upgrade redhat enterprise_linux_server to a higher version than 6.0,7.0,and avoid the version 6.0,7.0; Upgrade redhat enterprise_linux_server_aus to a higher version than 7.2,7.3,7.4,7.6,and avoid the version 7.2,7.3,7.4,7.6; Upgrade redhat enterprise_linux_server_eus to a higher version than 7.2,7.3,7.4,7.5,7.6,and avoid the version 7.2,7.3,7.4,7.5,7.6; Upgrade redhat enterprise_linux_server_tus to a higher version than 7.2,7.3,7.6,and avoid the version 7.2,7.3,7.6; Upgrade redhat enterprise_linux_workstation to a higher version than 6.0,7.0,and avoid the version 6.0,7.0; Upgrade xmlsoft libxml2 to a higher version than 2.9.4,and avoid the version (,2.9.4); Upgrade mcafee web_gateway to a higher version than 7.5.2.10,7.6.2.3,and avoid the version [7.5.0.0,7.5.2.10],[7.6.0.0,7.6.2.3]