CVE-2026-57019 (GCVE-0-2026-57019)
Vulnerability from cvelistv5
Published
2026-07-09 21:04
Modified
2026-07-10 13:29
Severity ?
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 (High) - CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M
CWE
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Summary
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
Impacted products
Vendor Product Version
Juniper Networks Junos OS Version: 0   < 23.2R2-S6
Version: 23.4   < 23.4R2-S7
Version: 24.2   < 24.2R2-S4
Version: 24.4   < 24.4R2-S4
Version: 25.2   < 25.2R2
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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.\\n\\nAffected scenarios are: MAP-T, or non-IP traffic encapsulated in IP (e.g. MPLS over GRE).\\n\\nWhen this issue happens the following logs can be observed:\\n\\nfpc\u003c#\u003e 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\\nfpc\u003c#\u003e 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\\n\\n\\n\\n\\nThis issue affects Junos OS on MX Series:\\n\\n\\n  *  all versions before 23.2R2-S6,\\n  *  23.4 versions before 23.4R2-S7,\\n  *  24.2 versions before 24.2R2-S4,\\n  *  24.4 versions before 24.4R2-S4,\\n  *  25.2 versions before 25.2R2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"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).\u003cbr\u003e\u003cp\u003e\\n\\nWhen a specific packet is received from device in the same broadcast domain, an affected system calculates the packet size incorrectly. 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