CVE-2021-0225 Junos OS Evolved: Stateless IP firewall filter does not work as expected
Stateless IP firewall filters using policer actions may fail to apply, allowing unauthorized traffic to bypass security controls on Juniper devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-0225?
CVE-2021-0225 is a medium-severity vulnerability in Juniper Junos Os Evolved, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-754
Which versions are affected by CVE-2021-0225?
It affects 1 product.
Products include Juniper Junos Os Evolved.
How do I fix CVE-2021-0225?
No fix has been published for CVE-2021-0225 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-0225 being exploited?
There is no known exploitation of CVE-2021-0225 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos Os Evolved
- CVE-2026-21902 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
- CVE-2023-28983 Junos OS Evolved: Shell Injection vulnerability in the gNOI server
- CVE-2025-21599 Denial of service in Junos OS Evolved
- CVE-2024-47502 Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS
- CVE-2024-39531 Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols
Sources
Also known as GHSA-v55m-mm25-x584.