title: Junos OS: EX4100, EX4400, EX4600, QFX5000 Series: A high rate of specific ICMP traffic will cause the PFE to hang
description:
An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
If an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.
This issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.
This issue affects:
Juniper Networks Junos OS
*  21.4R3 versions earlier than 21.4R3-S4;
*  22.1R3 versions earlier than 22.1R3-S3;
*  22.2R2 versions earlier than 22.2R3-S1;
*  22.3 versions earlier than 22.3R2-S2, 22.3R3;
*  22.4 versions earlier than 22.4R2;
*  23.1 versions earlier than 23.1R2.
problem types: CWE-1286 Improper Validation of Syntactic Correctness of Input
affected:
{
defaultStatus: unaffected
platforms: [EX4100, EX4400, EX4600, QFX5000 Series]
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 21.4R3-S4, status: affected, version: 21.4R3, versionType: semver
lessThan: 22.1R3-S3, status: affected, version: 22.1R3, versionType: semver
lessThan: 22.2R3-S1, status: affected, version: 22.2R2, versionType: semver
lessThan: 22.3R2-S2, 22.3R3, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R2, status: affected, version: 22.4, versionType: semver
lessThan: 23.1R2, status: affected, version: 23.1, 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 21.4R3-S4, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2, 23.1R2, 23.2R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.