Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability
Vulnerability Description
A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a NULL pointer dereference, resulting in a crash of the dhcpd process. While the dhcpd process is restarting, which may take up to approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period. Note: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Vulnerability Type
空指针解引用
Vulnerability Title
Cisco IOS XR 代码问题漏洞
Vulnerability Description
Cisco IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR软件的DHCP服务器功能(DHCPv4版本)存在代码问题漏洞，该漏洞源于某些DHCPv4消息在受影响的设备处理时未经正确验证。攻击者可利用该漏洞通过向受影响的设备发送格式错误的DHCPv4消息导致空指针解引用，从而导致系统崩溃
CVSS Information
N/A
Vulnerability Type
N/A