title: Junos OS & Junos OS Evolved: A specific IPv4 packet can lead to FPC restart.
description: The FPC (Flexible PIC Concentrator) of Juniper Networks Junos OS and Junos OS Evolved may restart after processing a specific IPv4 packet. Only packets destined to the device itself, successfully reaching the RE through existing edge and control plane filtering, will be able to cause the FPC restart. When this issue occurs, all traffic via the FPC will be dropped. By continuously sending this specific IPv4 packet, an attacker can repeatedly crash the FPC, causing an extended Denial of Service (DoS) condition. This issue can only occur when processing a specific IPv4 packet. IPv6 packets cannot trigger this issue. This issue affects: Juniper Networks Junos OS on MX Series with MPC10E or MPC11E and PTX10001: 19.2 versions prior to 19.2R1-S4, 19.2R2; 19.3 versions prior to 19.3R2-S2, 19.3R3; 19.4 versions prior to 19.4R1-S1, 19.4R2. Juniper Networks Junos OS Evolved on on QFX5220, and PTX10003 series: 19.2-EVO versions; 19.3-EVO versions; 19.4-EVO versions prior to 19.4R2-EVO. This issue does not affect Junos OS versions prior to 19.2R1. This issue does not affect Junos OS Evolved versions prior to 19.2R1-EVO.
problem types: CWE-467: Use of sizeof() on a Pointer Type
affected:
{
platforms: MX Series with MPC10E or MPC11E and PTX10001
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 19.2R1-S4, 19.2R2, status: affected, version: 19.2, versionType: custom
lessThan: 19.3R2-S2, 19.3R3, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R1-S1, 19.4R2, status: affected, version: 19.4, versionType: custom
}
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 19.2R1, status: unaffected, version: unspecified, versionType: custom
}
{
platforms: QFX5220, and PTX10003 series
product: Junos OS Evolved
vendor: Juniper Networks
versions:
status: affected, version: 19.2-EVO
status: affected, version: 19.3-EVO 19.2-EVO
lessThan: 19.4R2-EVO, status: affected, version: 19.4-EVO, versionType: custom
}
{
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 19.2R1-EVO, status: unaffected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue:
Junos OS: 19.2R1-S4, 19.2R2, 19.3R2-S2, 19.3R3, 19.4R1-S1, 19.4R2, 20.1R1, and all subsequent releases.
Junos OS Evolved: 19.4R2-EVO, 20.1R1-EVO, and all subsequent releases.
workarounds: There is no workaround for this issue.
Standard security best common practices such as limiting packet toward the RE only from trusted networks/host using firewall filter in combination with source address anti-spoofing should be applied to reduce the risk of exposure.