title: Junos OS: JRR200: Kernel crash upon receipt of a specific packet
description: An Improper Check or Handling of Exceptional Conditions vulnerability in packet processing on the network interfaces of Juniper Networks Junos OS on JRR200 route reflector appliances allows an adjacent, network-based attacker sending a specific packet to the device to cause a kernel crash, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue can only be triggered by an attacker on the local broadcast domain. Packets routed to the device are unable to trigger this crash. This issue affects Juniper Networks Junos OS on JRR200: All versions prior to 21.2R3-S4; 21.3 versions prior to 21.3R3-S4; 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S1; 22.2 versions prior to 22.2R2-S2, 22.2R3; 22.3 versions prior to 22.3R1-S2, 22.3R2; 22.4 versions prior to 22.4R1-S1, 22.4R2.
problem types: CWE-703 Improper Check or Handling of Exceptional Conditions
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 21.2R3-S4, status: affected, versionType: custom
version: 21.3, status: affected, lessThan: 21.3R3-S4, versionType: custom
version: 21.4, status: affected, lessThan: 21.4R3-S3, versionType: custom
version: 22.1, status: affected, lessThan: 22.1R3-S1, versionType: custom
version: 22.2, status: affected, lessThan: 22.2R2-S2, 22.2R3, versionType: custom
version: 22.3, status: affected, lessThan: 22.3R1-S2, 22.3R2, versionType: custom
version: 22.4, status: affected, lessThan: 22.4R1-S1, 22.4R2, versionType: custom
platforms: JRR200
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: ADJACENT_NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
]
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 21.2R3-S4, 21.4R3-S3, 22.1R3-S1, 22.2R2-S2, 22.2R3, 22.3R1-S2, 22.3R2, 22.4R1-S1, 22.4R2, 23.1R1, and all subsequent releases.
workarounds: Limit direct access to the device to only from trusted hosts and administrators.