中文描述:

Cisco Adaptive Security Appliances（ASA，自适应安全设备）Software和Cisco Firepower Threat Defense（FTD）Software都是由美国思科（Cisco）公司开发的程序。前者是一套运行于防火墙中的操作系统。后者是一套提供下一代防火墙服务的统一软件。TCP syslog是其中的一个TCP系统日志模块。 Cisco ASA Software和Cisco FTD Software中的TCP syslog模块存在安全漏洞。远程攻击者可利用该漏洞造成拒绝服务（缓冲区耗尽）。

英文描述:

A vulnerability in the TCP syslog module of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust the 1550-byte buffers on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing boundary check in an internal function. An attacker could exploit this vulnerability by establishing a man-in-the-middle position between an affected device and its configured TCP syslog server and then maliciously modifying the TCP header in segments that are sent from the syslog server to the affected device. A successful exploit could allow the attacker to exhaust buffer on the affected device and cause all TCP-based features to stop functioning, resulting in a DoS condition. The affected TCP-based features include AnyConnect SSL VPN, clientless SSL VPN, and management connections such as Secure Shell (SSH), Telnet, and HTTPS.

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