CVE-2023-44189 Junos OS Evolved: PTX10003 Series: MAC address validation bypass vulnerability
A network-adjacent attacker can bypass MAC address validation on Juniper PTX10003 routers, causing traffic loops and downstream network congestion.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-44189?
CVE-2023-44189 is a medium-severity vulnerability in Juniper Junos Os Evolved, published on 11 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2023-44189?
It affects 1 product.
Products include Juniper Junos Os Evolved.
How do I fix CVE-2023-44189?
No fix has been published for CVE-2023-44189 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-44189 being exploited?
There is no known exploitation of CVE-2023-44189 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos Os Evolved
- CVE-2026-21902 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
- CVE-2023-28983 Junos OS Evolved: Shell Injection vulnerability in the gNOI server
- CVE-2025-21599 Denial of service in Junos OS Evolved
- CVE-2024-47502 Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS
- CVE-2024-39531 Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols
Sources
Also known as GHSA-fwh4-pm54-qx88.