title: Junos OS and Junos OS Evolved: In an MPLS scenario upon receipt of a specific IPv6 packet an FPC will crash
description: An Improper Input Validation vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to cause a PFE crash and thereby a Denial of Service (DoS). An FPC will crash and reboot after receiving a specific transit IPv6 packet over MPLS. Continued receipt of this packet will create a sustained Denial of Service (DoS) condition. This issue does not affect systems configured for IPv4 only. This issue affects: Juniper Networks Junos OS All versions prior to 12.3R12-S21; 15.1 versions prior to 15.1R7-S10; 17.3 versions prior to 17.3R3-S12; 18.3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S4; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S2, 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S3-EVO; 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-S1-EVO, 21.3R3-EVO; 21.4 versions prior to 21.4R2-EVO.
problem types: CWE-20 Improper Input Validation
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 12.3R12-S21, status: affected, version: unspecified, versionType: custom
lessThan: 15.1R7-S10, status: affected, version: 15.1, versionType: custom
lessThan: 17.3R3-S12, status: affected, version: 17.3, versionType: custom
lessThan: 18.3R3-S6, status: affected, version: 18.3, versionType: custom
lessThan: 18.4R2-S9, 18.4R3-S9, status: affected, version: 18.4, versionType: custom
lessThan: 19.1R2-S3, 19.1R3-S7, status: affected, version: 19.1, versionType: custom
lessThan: 19.2R1-S7, 19.2R3-S3, status: affected, version: 19.2, versionType: custom
lessThan: 19.3R2-S7, 19.3R3-S4, status: affected, version: 19.3, versionType: custom
lessThan: 19.4R3-S5, status: affected, version: 19.4, versionType: custom
lessThan: 20.1R3, status: affected, version: 20.1, versionType: custom
lessThan: 20.2R3-S2, status: affected, version: 20.2, versionType: custom
lessThan: 20.3R3, status: affected, version: 20.3, versionType: custom
lessThan: 20.4R2-S2, 20.4R3, status: affected, version: 20.4, versionType: custom
lessThan: 21.1R2, status: affected, version: 21.1, versionType: custom
}
{
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S3-EVO, status: affected, version: unspecified, versionType: custom
lessThan: 21.2R3-EVO, status: affected, version: 21.2, versionType: custom
lessThan: 21.3R2-S1-EVO, 21.3R3-EVO, status: affected, version: 21.3, versionType: custom
lessThan: 21.4R2-EVO, status: affected, version: 21.4, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/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: 12.3R12-S21, 15.1R7-S10, 17.3R3-S12, 18.3R3-S6, 18.4R2-S9, 18.4R3-S9, 19.1R2-S3, 19.1R3-S7, 19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S4, 19.4R3-S5, 20.1R3, 20.2R3-S2, 20.3R3, 20.4R2-S2, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases.
Junos OS Evolved: 20.4R3-S3-EVO, 21.2R3-EVO, 21.3R2-S1-EVO, 21.3R3-EVO, 21.4R2-EVO, 22.1R1-EVO, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.