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.
References
| Link | Resource |
|---|---|
| https://supportportal.juniper.net/JSA110079 | Vendor Advisory |
Configurations
Configuration 1 (hide)
| AND |
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History
25 Oct 2026, 15:10
| Type | Values Removed | Values Added |
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| Summary |
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Information
Published : 2026-07-09 22:17
Updated : 2026-10-25 15:10
NVD link : CVE-2026-57019
Mitre link : CVE-2026-57019
CVE.ORG link : CVE-2026-57019
JSON object : View
Products Affected
juniper
- mx2008
- mx304
- mx2010
- mx10008
- mx204
- mx2020
- mx480
- mx301
- mx960
- mx240
- junos
- mx10004
CWE
CWE-1284
Improper Validation of Specified Quantity in Input