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CVE-2020-3566CISA KEV

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability

CISA lists this Cisco IOS XR vulnerability as known exploited. The vendor's advisory has the fixed versions.

CISA KEVVendor advisoryNVD

CISA catalog record

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.

Product
IOS XR
Added to KEV
3 Nov 2021
Federal remediation due
3 May 2022
Known ransomware use
Not reported

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 11:21 UTC · 251 of 253 readable · 250 fully read · documentation 0/409 current

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