CVE-2021-0225: Juniper Junos OS Evolved

Medium severity, CVSS 5.8. EPSS: 0.7% chance of exploitation in the next 30 days.

An Improper Check for Unusual or Exceptional Conditions in Juniper Networks Junos OS Evolved may cause the stateless firewall filter configuration which uses the action 'policer' in certain combinations with other options to not take effect. An administrator can use the following CLI command to see the failures with filter configuration: user@device> show log kfirewall-agent.log | match ERROR Jul 23 14:16:03 ERROR: filter not supported This issue affects Juniper Networks Junos OS Evolved: Versions 19.1R1-EVO and above prior to 20.3R1-S2-EVO, 20.3R2-EVO. This issue does not affect Juniper Networks Junos OS.

Affected products

• Juniper Junos OS Evolved: version 19.1 only; version 19.2 only; version 19.3 only; version 20.1 only; version 20.2 only; version 20.3 only

Published 2021-04-22. Last modified 2026-06-17.