title: Junos OS Evolved: A high rate of specific hostbound traffic will cause unexpected hostbound traffic delays or drops
description: An Allocation of Resources Without Limits or Throttling vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved allows unauthenticated network based attacker to cause a Denial of Service (DoS). On all Junos Evolved platforms hostbound protocols will be impacted by a high rate of specific hostbound traffic from ports on a PFE. Continued receipt of this amount of traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS Evolved: 21.2 versions prior to 21.2R3-EVO; 21.3 versions prior to 21.3R2-EVO. This issue does not affect Juniper Networks Junos OS Evolved versions prior to 21.2R1.
problem types: CWE-770 Allocation of Resources Without Limits or Throttling
affected:
{
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 21.2R1-EVO, status: unaffected, version: unspecified, versionType: custom
lessThan: 21.2R3-EVO, status: affected, version: 21.2, versionType: custom
lessThan: 21.3R2-EVO, status: affected, version: 21.3, versionType: custom
}
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
]
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: 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and all subsequent releases.
workarounds: There are no viable workarounds for this issue.
To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks, hosts and users.