An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX7000 Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).
On all ACX 7000 Series platforms running Junos OS Evolved, and configured with IRBs, if a Customer Edge device (CE) device is dual homed to two Provider Edge devices (PE) a traffic loop will occur when the CE sends multicast packets. This issue can be triggered by IPv4 and IPv6 traffic.
This issue affects Junos OS Evolved: All versions from 22.2R1-EVO and later versions before 22.4R2-EVO,
This issue does not affect Junos OS Evolved versions before 22.1R1-EVO.
To be potentially exposed to this issue the device must be configured as follows:
Juniper SIRT is not aware of any malicious exploitation of this vulnerability. However, multiple occurrences of this issue have been reported in production.
This issue was seen during production usage.
The following software releases have been updated to resolve this specific issue: 22.4R2-EVO, 23.2R1-EVO, and all subsequent releases.
This issue is being tracked as 1691134 which is visible on the Customer Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
2024-07-10: Initial Publication 2024-09-13: Minor formatting change to CVSS field