CVE-2020-3566: Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability

CVE-2020-3566 · Severity: critical · CVSS 8.6 · Exploited in the wild · Published 2021-11-03

A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software allows an unauthenticated, remote attacker to exhaust process memory. The issue stems from insufficient queue management for IGMP packets, which can lead to process instability or crashes in routing protocols.

Technologies: Cisco IOS XR. Vendors: Cisco.

Quick answers

Is CVE-2020-3566 exploited in the wild?
Yes. CVE-2020-3566 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2020-3566?
Critical severity, with a CVSS score of 8.6, published 3 November 2021.
Which products and versions are affected?
Cisco IOS XR Software 6.4.2 and others.
Is there a fix for CVE-2020-3566?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2020-3566 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2020-3566?
Check whether you run Cisco IOS XR. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Cisco IOS XR Software 6.4.2 and others

Timeline

  • 2020-08-29: disclosed: NVD Published Date
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: advisory: Advisory published/updated date provided in text
  • 2021-11-03: exploited: Reported as exploited in the wild in the advisory summary and CISA KEV catalog.

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