CVE-2026-33774

An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine pfe of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass the configured firewall filter and access the control-plane of the device. On MX platform...

PT-2026-31798

An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine pfe of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass the configured firewall filter and access the control-plane of the device. On MX platform...

CVE-2025-52985

A Use of Incorrect Operator vulnerability in the Routing Engine firewall of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to bypass security restrictions. When a firewall filter which is applied to the lo0 or re:mgmt interface references a prefix list with...

CVE-2024-21597

An Exposure of Resource to Wrong Sphere vulnerability in the Packet Forwarding Engine PFE of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass the intended access restrictions. In an Abstracted Fabric AF scenario if routing-instances RI are...

PT-2024-1131 · Juniper Networks · Junos

Name of the Vulnerable Software and Affected Versions: Juniper Networks Junos OS on MX Series versions earlier than 20.4R3-S9 Juniper Networks Junos OS on MX Series version 21.2 versions earlier than 21.2R3-S3 Juniper Networks Junos OS on MX Series version 21.4 versions earlier than 21.4R3-S5...

CVE-2019-0041

On EX4300-MP Series devices with any lo0 filters applied, transit network traffic may reach the control plane via loopback interface lo0. The device may fail to forward such traffic. This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R1-S2, 18.2R2 on EX4300-MP Series. This...

Juniper Junos lo0 Firewall Bypass (PSN-2012-07-651)

According to its self-reported version number, the remote Junos router has a firewall bypass vulnerability. This issue is present when log or syslog actions are used along with discard within a firewall filter term deployed on the lo0 loopback interface. When the receive rate is very high, some...