CVE:CVE-2020-3120
CNNVD:CNNVD-202002-129
Cisco NX-OS Software等都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。Cisco IOS XR是一套为其网络设备开发的操作系统。
Cisco FXOS Software、Cisco IOS XR Software和Cisco NX-OS Software中Cisco Discovery Protocol的实现存在输入验证错误漏洞，该漏洞源于程序在处理Cisco Discovery Protocol时，缺少检查。远程攻击者可通过发送恶意的Cisco Discovery Protocol数据包重新加载受影响的设备，造成拒绝服务。
solution:Upgrade cisco firepower_extensible_operating_system to a higher version than 2.3.1.173,2.6.1.187,2.7.1.106,and avoid the version (,2.3.1.173],[2.6,2.6.1.187),[2.7,2.7.1.106); Upgrade cisco fxos to a higher version than 2.4,and avoid the version 2.4; Upgrade cisco ios_xr to a higher version than 5.2.5,6.4.2,6.5.3,6.6.25,7.0.1,and avoid the version 5.2.5,6.4.2,6.5.3,6.6.25,7.0.1; Upgrade cisco nx-os to a higher version than 6.2\(29\,8.4\(1a\,5.2\(1\sv5\(1.3\,5.2,5.2\(1\sv3\(4.1b\,9.3\(2\,7.0\(3\i7\(8\,7.3\(6\n1\(1\,6.2\(24\,7.3\(5\d1\(1\,8.2\(5\,8.4\(2\,13.2\(9b\,14.2\(1j\,and avoid the version [5.2,6.2\(29\)),[7.3,8.4\(1a\)),[5.2,5.2\(1\)sv5\(1.3\)),(,5.2],(,5.2\(1\)sv3\(4.1b\)),[7.0\(3\)f2,9.3\(2\)),[7.0\(3\)i,7.0\(3\)i7\(8\)),(,7.3\(6\)n1\(1\)),(,6.2\(24\)),[7.2,7.3\(5\)d1\(1\)),[8.0,8.2\(5\)),[8.3,8.4\(2\)),(,13.2\(9b\)),[14.0,14.2\(1j\)); Upgrade cisco ucs_manager to a higher version than 3.2\(3m\,4.0\(4g\,and avoid the version (,3.2\(3m\)),[4.0,4.0\(4g\))