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    CVE-2026-33773

    An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series and QFX Series device allows an unauthenticated, network-based attacker to cause an integrity impact to downstream networks. When the same family inet or inet6 filter is applied on an IRB interface and on a physical interface as egress filter on EX4100, EX4400, EX4650 and QFX5120 devices, only one of the two filters will be applied, which can lead to traffic being sent out one of these interfaces which should have been blocked. This issue affects Junos OS on EX Series and QFX Series: * 23.4 version 23.4R2-S6, * 24.2 version 24.2R2-S3. No other Junos OS versions are affected.

    Published:Apr 9, 2026
    Last Modified:Apr 18, 2026
    EPS:Apr 9, 2026
    EPSS Score:0.00047
    CVSS Score:5.8

    Affected Products

    Vendor
    Juniper
    Product
    Ex2300
    Vendor
    Juniper
    Product
    Ex2300-c
    Vendor
    Juniper
    Product
    Ex3400
    Vendor
    Juniper
    Product
    Ex4000
    Vendor
    Juniper
    Product
    Ex4100
    Vendor
    Juniper
    Product
    Ex4100-f
    Vendor
    Juniper
    Product
    Ex4100-h
    Vendor
    Juniper
    Product
    Ex4300
    Vendor
    Juniper
    Product
    Ex4400
    Vendor
    Juniper
    Product
    Ex4600
    Vendor
    Juniper
    Product
    Ex4650
    Vendor
    Juniper
    Product
    Ex9204
    Vendor
    Juniper
    Product
    Ex9208
    Vendor
    Juniper
    Product
    Ex9214
    Vendor
    Juniper
    Product
    Junos
    Vendor
    Juniper
    Product
    Qfx10008
    Vendor
    Juniper
    Product
    Qfx10016
    Vendor
    Juniper
    Product
    Qfx5110
    Vendor
    Juniper
    Product
    Qfx5120
    Vendor
    Juniper
    Product
    Qfx5130
    Vendor
    Juniper
    Product
    Qfx5200
    Vendor
    Juniper
    Product
    Qfx5210
    Vendor
    Juniper
    Product
    Qfx5220
    Vendor
    Juniper
    Product
    Qfx5230-64cd
    Vendor
    Juniper
    Product
    Qfx5240
    Vendor
    Juniper
    Product
    Qfx5241
    Vendor
    Juniper
    Product
    Qfx5700
    Vendor
    Juniper Networks
    Product
    Junos Os

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High