title: Junos OS: QFX5k: l2 loop in the overlay impacts the stability in a EVPN/VXLAN environment
description:
An Improperly Implemented Security Check for Standard vulnerability in storm control of Juniper Networks Junos OS QFX5k devices allows packets to be punted to ARP queue causing a l2 loop resulting in a DDOS violations and DDOS syslog.
This issue is triggered when Storm control is enabled and ICMPv6 packets are present on device.
This issue affects Juniper Networks:
Junos OS
*  All versions prior to 20.2R3-S6 on QFX5k;
*  20.3 versions prior to 20.3R3-S5 on QFX5k;
*  20.4 versions prior to 20.4R3-S5 on QFX5k;
*  21.1 versions prior to 21.1R3-S4 on QFX5k;
*  21.2 versions prior to 21.2R3-S3 on QFX5k;
*  21.3 versions prior to 21.3R3-S2 on QFX5k;
*  21.4 versions prior to 21.4R3 on QFX5k;
*  22.1 versions prior to 22.1R3 on QFX5k;
*  22.2 versions prior to 22.2R2 on QFX5k.
problem types: 358: Improperly Implemented Security Check for Standard vulnerability
affected:
{
defaultStatus: unaffected
platforms: QFX5k
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.2R3-S6, status: affected, version: 0, versionType: semver
lessThan: 20.3R3-S5, status: affected, version: 20.3, versionType: semver
lessThan: 20.4R3-S5, status: affected, version: 20.4, versionType: semver
lessThan: 21.1R3-S4, status: affected, version: 21.1, versionType: semver
lessThan: 21.2R3-S3, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S2, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R2, status: affected, version: 22.2, versionType: semver
}
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
]
format: CVSS
scenarios: GENERAL
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 20.2R3-S6, 20.3R3-S5, 20.4R3-S5, 21.1R3-S4, 21.2R3-S3, 21.3R3-S2, 21.4R3, 22.1R3, 22.2R2, 22.3R1, and all subsequent releases.
workarounds: Disable storm control configuration.