CVE-2020-3569
Actively exploited. CVE-2020-3569 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- Cisco IOS XR has a memory exhaustion vulnerability that can crash the IGMP process.
- Who is affected
- Deployments of Cisco IOS XR Software.
- Urgency
- Immediate action is required due to the critical nature of the vulnerability and its exploitation status.
- Action
- Apply the latest updates for Cisco IOS XR Software.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 87% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2020-3569: Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilitycisa-kev · 2021-11-03
External references
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