VULNERABILITY INTELLIGENCE

CVE-2020-3566

CVSS score8.6 HIGH
EPSS probability3.70%
CISA KEVKnown exploited vulnerability
Published2020-08-29
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Known Exploited Vulnerability

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability

Vendor / product: Cisco / IOS XR

Description

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.

Weakness classification

  • psirt@cisco.com: CWE-400
  • nvd@nist.gov: CWE-770

Primary references