CVE:CVE-2011-4006
CNNVD:CNNVD-201205-039
Cisco Adaptive Security Appliances（ASA，自适应安全设备）Software是美国思科（Cisco）公司的一套运行于防火墙中的操作系统。
Cisco Adaptive Security Appliances (ASA) 5500系列设备中的ESMTP检查功能存在漏洞。远程攻击者可利用该漏洞借助未明关闭序列导致拒绝服务（CPU消耗），也称Bug ID CSCtt32565。
solution:Upgrade cisco adaptive_security_appliance_software to a higher version than 8.2(1,8.2(2,8.2(3,8.2(3.9,8.2(4,8.2(4.1,8.2(4.4,8.2(5,8.2.1,8.2.2,8.2.2:interim,8.2.3,8.3(1,8.3(2,8.3.1,8.3.1:interim,8.3.2,8.4,8.4(1,8.4(1.11,8.4(2,8.4(2.11,8.5,8.5(1,8.5(1.4,and avoid the version 8.2(1),8.2(2),8.2(3),8.2(3.9),8.2(4),8.2(4.1),8.2(4.4),8.2(5),8.2.1,8.2.2,8.2.2:interim,8.2.3,8.3(1),8.3(2),8.3.1,8.3.1:interim,8.3.2,8.4,8.4(1),8.4(1.11),8.4(2),8.4(2.11),8.5,8.5(1),8.5(1.4); Upgrade cisco 5500_series_adaptive_security_appliance to a higher version than *