title: Junos OS: QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600: Packet flooding will occur when IGMP traffic is sent to an isolated VLAN
description:
An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).
When a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.
This issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.
This issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:
*  All versions prior to 20.4R3-S5;
*  21.1 versions prior to 21.1R3-S4;
*  21.2 versions prior to 21.2R3-S3;
*  21.3 versions prior to 21.3R3-S5;
*  21.4 versions prior to 21.4R3-S2;
*  22.1 versions prior to 22.1R3;
*  22.2 versions prior to 22.2R3;
*  22.3 versions prior to 22.3R2.
problem types: CWE-703: Improper Check or Handling of Exceptional Conditions
affected:
{
defaultStatus: unaffected
platforms: [QFX5000 Series, EX2300, EX3400, EX4100, EX4400, EX4600]
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S5, status: affected, version: 0, 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-S5, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3-S2, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R3, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R2, status: affected, version: 22.3, versionType: semver
}
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
]
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 20.4R3-S5, 21.1R3-S4, 21.2R3-S3, 21.3R3-S5, 21.4R3-S2, 22.1R3, 22.2R3, 22.3R2, 22.4R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.