PT-2026-56973 · Juniper Networks · Junos
Publicado
2026-07-09
·
Atualizado
2026-07-09
·
CVE-2026-57019
CVSS v3.1
6.5
Média
| Vetor | AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
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.
Correção
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