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CVE-2020-3566 is a denial-of-service vulnerability in the Distance Vector Multicast Routing Protocol feature of Cisco IOS XR Software. The flaw is caused by insufficient queue management for Internet Group Management Protocol packets handled by the affected DVMRP functionality. By sending crafted IGMP traffic to a vulnerable device, an unauthenticated remote attacker can drive excessive memory consumption in the relevant process. The resulting resource exhaustion can destabilize the device and affect additional processes beyond IGMP, including interior and exterior routing protocols.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A resource exhaustion vulnerability in a distributed operating system caused by insufficient IGMP queue management.
A resource exhaustion vulnerability in a distributed operating system caused by insufficient IGMP queue management; the content explicitly notes it was exploited in the wild.
A resource-exhaustion denial-of-service issue in a distributed operating system tied to insufficient IGMP queue management; explicitly noted as exploited in the wild (per CISA KEV).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.