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A vulnerability in the Layer 2 Tunneling Protocol (L2TP) parsing function of Cisco IOS (12.0 through 12.4 and 15.0 through 15.6) and Cisco IOS XE (3.1 through 3.18) could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to insufficient validation of L2TP packets. An attacker could exploit this vulnerability by sending a crafted L2TP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS or Cisco IOS XE Software if the L2TP feature is enabled for the device and the device is configured as an L2TP Version 2 (L2TPv2) or L2TP Version 3 (L2TPv3) endpoint. By default, the L2TP feature is not enabled. Cisco Bug IDs: CSCuy82078.

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资源管理错误

Cisco IOS和IOS XE Software 安全漏洞

Cisco IOS和IOS XE Software都是美国思科（Cisco）公司为其网络设备开发的操作系统。 Cisco IOS 12.0至12.4版本和15.0至15.6版本和Cisco IOS XE 3.1至3.18版本中的Layer 2 Tunneling Protocol(L2TP)解析功能存在安全漏洞，该漏洞源于程序没有充分过滤L2TP数据包。远程攻击者可通过发送大量的数据包利用该漏洞造成拒绝服务（设备重载）。

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