title: Junos OS: MX Series: In a PTP scenario a prolonged routing protocol churn can trigger an FPC reboot
description:
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).
On Junos MX Series platforms with Precision Time Protocol (PTP) configured, a prolonged routing protocol churn can lead to an FPC crash and restart.
This issue affects Juniper Networks Junos OS on MX Series:
*  All versions prior to 20.4R3-S4;
*  21.1 version 21.1R1 and later versions;
*  21.2 versions prior to 21.2R3-S2;
*  21.3 versions prior to 21.3R3-S5;
*  21.4 versions prior to 21.4R3;
*  22.1 versions prior to 22.1R3;
*  22.2 versions prior to 22.2R1-S1, 22.2R2.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
defaultStatus: unaffected
platforms: MX Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S4, status: affected, version: 0, versionType: semver
lessThan: 21.1*, status: affected, version: 21.1R1, versionType: semver
lessThan: 21.2R3-S2, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S5, 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: 22.2R1-S1, 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 20.4R3-S4, 21.2R3-S2, 21.3R3-S5, 21.4R3, 22.1R3, 22.2R1-S1, 22.2R2, 22.3R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.