Cisco IOS Software and Cisco IOS XE Software vulnerabilities

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS and IOS XE Software allows an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS). It exists because the software performs incomplete input validation of option 82 information in DHCPv4 packets from DHCP relay agents. Sending a crafted DHCPv4 packet can cause a heap overflow and device reload.

A vulnerability in the Smart Install feature of Cisco IOS and IOS XE Software is caused by improper validation of packet data. An unauthenticated remote attacker can send a crafted Smart Install message to TCP port 4786, causing a buffer overflow that may lead to device reload, arbitrary code execution, or a watchdog crash.

A vulnerability in the IKEv1 implementation of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS). It is due to improper validation of specific IKEv1 packets. Sending crafted IKEv1 packets during IKE negotiation can cause a device reload.

A vulnerability in the IKEv2 module of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak or a reload of an affected device, leading to a denial of service (DoS). It is due to incorrect processing of certain IKEv2 packets. Sending crafted IKEv2 packets can cause continuous memory consumption and eventual device reload.

A vulnerability in the Smart Install feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS). It is due to improper validation of packet data. Sending a crafted packet to TCP port 4786 can cause a device reload. Only Smart Install client switches are affected, not Smart Install directors.

A vulnerability in the QoS subsystem of Cisco IOS and IOS XE Software is due to incorrect bounds checking of values in packets destined for UDP port 18999. An unauthenticated remote attacker can send malicious packets, causing a buffer overflow that may lead to arbitrary code execution with elevated privileges or a device reload.