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Medium severity6.5NVD Advisory· Published Jul 9, 2026· Updated Jul 13, 2026

CVE-2026-57019

CVE-2026-57019

Description

An Improper Validation of Specified Quantity in Input vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).

When a specific packet is received from device in the same broadcast domain, an affected system calculates the packet size incorrectly. This causes further packet processing to fail, which triggers an FPC major error, resulting in a FPC reset impacting traffic until the FPC has automatically recovered.

Affected scenarios are: MAP-T, or non-IP traffic encapsulated in IP (e.g. MPLS over GRE).

When this issue happens the following logs can be observed:

fpc<#> CMError: /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb), scope: pfe, category: functional, severity: major, module: MQSS(0), type: LI: Unroll TAIL length overflow, oc_category: default fpc<#> Performing action reset-fru for error /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb) in module: MQSS(0) with scope: pfe category: functional level: major, oc_category: default

This issue affects Junos OS on MX Series:

  • all versions before 23.2R2-S6,
  • 23.4 versions before 23.4R2-S7,
  • 24.2 versions before 24.2R2-S4,
  • 24.4 versions before 24.4R2-S4,
  • 25.2 versions before 25.2R2.

Affected products

43
  • Juniper Networks/Junos42 versions
    cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*+ 41 more
    • cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*range: <23.2
    • cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.2:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:23.4:r2-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.2:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:24.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:*
  • Juniper Networks/Junos OS on MX Seriesllm-fuzzy
    Range: <23.2R2-S6, <23.4R2-S7, <24.2R2-S4, <24.4R2-S4, <25.2R2

Patches

Vulnerability mechanics

References

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