Technical Severity
HIGH
CVSS v3.1 Metrics
8.6
/ 10
Minimal Risk
Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploitation Likelihood
EPSS Prediction
7.17
%
Predictive Probability
Percentile Rank
91.4
th
Documented as more likely to be exploited than 91.4% of known CVEs.
Detection Date
Nov 03, 2021
Remediation Due
May 03, 2022
CISA Catalog Active
Threat Analysis
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.
Remediation Directive
Apply updates per vendor instructions.