title: Junos OS Evolved: Packets which are not destined to the router can reach the RE
description:
An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in the NetworkStack agent daemon (nsagentd) of Juniper Networks Junos OS Evolved allows an unauthenticated network based attacker to cause limited impact to the availability of the system.
If specific packets reach the Routing-Engine (RE) these will be processed normally even if firewall filters are in place which should have prevented this. This can lead to a limited, increased consumption of resources resulting in a Denial-of-Service (DoS), and unauthorized access.
CVE-2023-44196 is a prerequisite for this issue.
This issue affects Juniper Networks Junos OS Evolved:
*  21.3-EVO versions prior to 21.3R3-S5-EVO;
*  21.4-EVO versions prior to 21.4R3-S4-EVO;
*  22.1-EVO version 22.1R1-EVO and later;
*  22.2-EVO version 22.2R1-EVO and later;
*  22.3-EVO versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO;
*  22.4-EVO versions prior to 22.4R3-EVO.
This issue doesn't not affected Junos OS Evolved versions prior to 21.3R1-EVO.
problem types: CWE-923 Improper Restriction of Communication Channel to Intended Endpoints
affected:
{
defaultStatus: unaffected
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 21.3R1-EVO, status: unaffected, version: 0, versionType: semver
lessThan: 21.3R3-S5-EVO, status: affected, version: 21.3-EVO, versionType: semver
lessThan: 21.4R3-S4-EVO, status: affected, version: 21.4-EVO, versionType: semver
lessThan: 22.1*-EVO, status: affected, version: 22.1R1-EVO, versionType: semver
lessThan: 22.2*-EVO, status: affected, version: 22.2R1-EVO, versionType: semver
lessThan: 22.3R2-S2-EVO, 22.3R3-S1-EVO, status: affected, version: 22.3-EVO, versionType: semver
lessThan: 22.4R3-EVO, status: affected, version: 22.4-EVO, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: LOW
baseScore: 5.4
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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 Evolved 21.3R3-S5-EVO, 21.4R3-S4-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R1-EVO, and all subsequent releases.
workarounds: There are no known workarounds for this issue.