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5.4

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...

CVE-2023-44189 · published 3 years ago
Summary


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 thi...

What to do
  • Update juniper junos_os_evolved to version 21.4 or later.
Affected software
VendorProductAffected versions
juniper junos_os_evolved < 21.4
21.4
22.1
22.2
22.3
22.4
23.2
cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*
Original advisory text
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...

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.






References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
5.4 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-346Origin Validation Error
Timeline
Published11 Oct 2023
Updated29 Oct 2026
First seen29 Sep 2026
Sources
CVE-2023-44189 · NVD
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