CVE-2026-33774 Junos OS: MX Series: Firewall filters on lo0.<non-0> in the default routing instance are not in effect

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-2026-33774 Junos OS: MX Series: Firewall filters on lo0.<non-0> in the default routing instance are not in effect

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-2026-33774

CVE-2026-33774 affects Junos OS on Juniper MX Series (MPC10/11, LC4800/LC9600 line cards and MX304). An improper check allows an unauthenticated, network-based attacker to bypass firewall filters applied to loopback interfaces lo0.n (n != 0) that are in the default routing instance, enabling pote...

PT-2026-31798

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS on MX Series versions prior to 23.2R2-S6 Juniper Networks Junos OS on MX Series versions 23.4 before 23.4R2-S7 Juniper Networks Junos OS on MX Series versions 24.2 before 24.2R2 Juniper Networks Junos OS on MX Series...