CVE-2023-44189

Junos OS Evolved: PTX10003 Series: MAC address validation bypass vulnerability

MEDIUM

5.4

CVSS Score

Published: October 11, 2023 at 09:00 PM UTC

Updated: June 17, 2026 at 06:27 AM UTC

6 products affected across 2 vendorsJunos OS EvolvedPtx10003Ptx10003 80C

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Severity

MEDIUM5.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

An Origin Validation vulnerability in MAC address validation of Juniper Networks Junos OS Evolved on PTX10003 Series allows a network-adjacent attacker to bypass MAC address checking, allowing MAC addresses not intended to reach the adjacent LAN to be forwarded to the downstream network. Due to this issue, the router will start forwarding traffic if a valid route is present in forwarding-table, causing a loop and congestion in the downstream layer-2 domain connected to the device. This issue affects Juniper Networks Junos OS Evolved on PTX10003 Series: * All versions prior to 21.4R3-S4-EVO; * 22.1 versions prior to 22.1R3-S3-EVO; * 22.2 version 22.2R1-EVO and later versions; * 22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO; * 22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO; * 23.2 versions prior to 23.2R2-EVO.

Affected

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

Junos OS Evolved · Juniper

95%

Affected range stops below 21.4, so it looks safe — our inference, not a vendor statement

juniper-ptx10003 (environment) · juniper-ptx10003-160c (environment) · juniper-ptx10003-80c (environment) · juniper-ptx10003-81cd (environment)

Junos OS Evolved · Juniper Networks

60%

v < 21.4R3-S4-EVO22.1 ≤ v < 22.1R3-S3-EVO22.2R1-EVO ≤ v < 22.2*-EVO22.3 ≤ v < 22.3R2-S2-EVO, 22.3R3-S1-EVO22.4 ≤ v < 22.4R2-S1-EVO, 22.4R3-EVO23.2 ≤ v < 23.2R2-EVO22.1 22.2R1-EVO 22.3 22.4 23.2

Affected range stops below 21.4R3-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S3-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 22.4R2-S1-EVO, 22.4R3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-EVO, so it looks safe — our inference, not a vendor statement

Ptx10003 · Juniperdevice

80%

All versions

Ptx10003 160C · Juniperdevice

80%

All versions

Ptx10003 80C · Juniperdevice

80%

All versions

Ptx10003 81Cd · Juniperdevice

80%

All versions

Remediation

No guide yet

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

Patch and advisory references

https://supportportal.juniper.net/JSA73153

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA73153

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.4MEDIUM[email protected]

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: LOW

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-346

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