CVE-2020-3566: Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability
Description
CVE-2020-3566 is a vulnerability in Cisco IOS XR software's Distance Vector Multicast Routing Protocol (DVMRP) where improper handling of IGMP packets can lead to memory exhaustion or immediate crash of the IGMP process. This flaw allows unauthenticated remote attackers to disrupt service by causing process crashes or resource depletion.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco IOS XR's DVMRP component incorrectly processes Internet Group Management Protocol (IGMP) packets, which can be exploited by unauthenticated remote attackers to cause the IGMP process to crash immediately or consume excessive memory, eventually leading to a crash. This vulnerability is identified as CWE-400 (Uncontrolled Resource Consumption). It has been observed exploited in the wild.
Potential Impact
Successful exploitation results in denial of service conditions by crashing the IGMP process or exhausting system memory, potentially disrupting multicast routing functionality on affected Cisco IOS XR devices.
Mitigation Recommendations
No explicit patch or remediation details are provided in the available data. Patch status is not yet confirmed — check the Cisco vendor advisory for current remediation guidance. Until a fix is applied, consider limiting exposure of affected devices to untrusted networks to reduce risk.
Threat ID: 6adc6f603fe894698b2dd9a3
Added to database: 10/24/2026, 08:42:08 UTC
Last enriched: 10/24/2026, 09:27:40 UTC
Last updated: 10/24/2026, 09:30:24 UTC
Views: 3
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