CVE Feed

    Dashboard / CVE / CVE-2026-57031

    CVE-2026-57031

    An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters. On MX Series devices with MPC10/11, LC4800/9600, and MX304 with subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect.  This issue affects Junos OS on MX with MPC10/11, LC4800/9600/4802, and MX304: * 23.2 versions from 23.2R2-S1 before 23.2R2-S7, * 23.4 versions from 23.4R2 before 23.4R2-S7, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2.

    Published:Jul 9, 2026
    Last Modified:Aug 25, 2026
    EPS:Jul 9, 2026
    EPSS Score:0.00238
    CVSS Score:4.7

    Affected Products

    Vendor
    Juniper
    Product
    Junos
    Vendor
    Juniper
    Product
    Lc4800
    Vendor
    Juniper
    Product
    Lc4802
    Vendor
    Juniper
    Product
    Lc9600
    Vendor
    Juniper
    Product
    Mpc10e-10c
    Vendor
    Juniper
    Product
    Mpc10e-15c
    Vendor
    Juniper
    Product
    Mpc11
    Vendor
    Juniper
    Product
    Mx304
    Vendor
    Juniper Networks
    Product
    Junos Os

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-33800 (CVSS 7.1) — An Unchecked Input for Loop Condition vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks …
    CVE-2026-21901 (CVSS 6.7) — A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos…
    CVE-2026-33791 (CVSS 8.4) — An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved …
    CVE-2026-33790 (CVSS 8.7) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Ne…
    CVE-2026-33787 (CVSS 6.8) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd)…
    CVE-2026-33785 (CVSS 6.3) — A Missing Authorization vulnerability in the CLI of Juniper Networks Junos OS on MX Series allows a local, aut…
    CVE-2026-33781 (CVSS 7.1) — An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (pfe) of…
    CVE-2026-33778 (CVSS 8.7) — An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd and i…
    CVE-2026-33776 (CVSS 6.8) — A Missing Authorization vulnerability in the CLI of Juniper Networks Junos OS and Junos OS Evolved allows a lo…
    CVE-2026-33797 (CVSS 7.1) — An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthe…

    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