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CVE-2023-44195

Junos OS Evolved: Packets which are not destined to the router can reach the RE

MEDIUM
5.3
CVSS Score
Published: October 12, 2023 at 11:04 PM UTC
Updated: June 17, 2026 at 06:27 AM UTC
2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved· Juniper
95%
21.421.4 r121.4 r1-s121.4 r1-s221.4 r221.4 r2-s121.4 r2-s221.4 r321.4 r3-s121.4 r3-s221.4 r3-s322.122.222.2 r122.2 r1-s122.2 r222.2 r2-s122.2 r2-s222.322.3 r122.3 r1-s122.3 r222.3 r2-s122.3 r2-s222.3 r3-s122.422.4 r122.4 r1-s122.4 r1-s222.4 r222.4 r2-s122.4 r2-s223.1 r123.1 r223.1 r323.2 r1-s123.2 r1-s223.2 r2-s123.2 r2-s2
Junos OS Evolved· Juniper Networks
60%
21.3-EVO ≤ v < 21.3R3-S5-EVO21.4-EVO ≤ v < 21.4R3-S4-EVO22.1R1-EVO ≤ v < 22.1*-EVO22.2R1-EVO ≤ v < 22.2*-EVO22.3-EVO ≤ v < 22.3R2-S2-EVO, 22.3R3-S1-EVO22.4-EVO ≤ v < 22.4R3-EVO21.3-EVO21.4-EVO22.1R1-EVO22.2R1-EVO22.3-EVO22.4-EVO
Vendor states this is fixed in 21.3R1-EVO (unaffected)
Affected range stops below 21.3R3-S5-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.4R3-S4-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.1*-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2*-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.3R2-S2-EVO, 22.3R3-S1-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.4R3-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://supportportal.juniper.net/JSA73160

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-923NVD-CWE-Other

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