CVE-2020-3566: Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust process memory of an affected device. The vulnerability is due to insufficient queue management for Internet Group Management Protocol (IGMP) packets. An attacker could exploit this vulnerability by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to cause memory exhaustion, resulting in instability of other processes. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address this vulnerability.
Other sources
Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.
— CISA
Affected Software
Event History
Frequently Asked Questions
What is CVE-2020-3566?
CVE-2020-3566 is a vulnerability in Cisco IOS XR Software that could allow an unauthenticated, remote attacker to exhaust process memory of an affected device.
How does CVE-2020-3566 affect Cisco IOS XR?
CVE-2020-3566 affects Cisco IOS XR Software and can cause an exhaustion of process memory on the affected device.
What is the severity of CVE-2020-3566?
CVE-2020-3566 has a severity rating of 7.5 (high).
Which products are affected by CVE-2020-3566?
The Cisco IOS XR version 6.4.2 is affected by CVE-2020-3566.
How can I fix CVE-2020-3566?
To fix CVE-2020-3566, Cisco recommends updating to a fixed software release.