A Stack-based Buffer Overflow vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a network-based attacker, authenticated with low privileges to cause a Denial-of-Service (DoS).

Subscribing to telemetry sensors at scale causes all FPC connections to drop, resulting in an FPC crash and restart.
The issue was not seen when YANG packages for the specific sensors were installed.

 

This issue affects Junos OS: 

 

• all versions before 22.4R3-S7,
• 23.2 version before 23.2R2-S4,
• 23.4 versions before 23.4R2.

 

A device is only exposed to this issue if GRPC services are configured:

[ system services extension-service request-response grpc ]

 

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

 

This issue was found during internal product security testing or research.

The following software releases have been updated to resolve this specific issue: 22.4R3-S7, 23.2R2-S4, 23.4R2, 24.2R1, and all subsequent releases.

 

This issue is being tracked as 1811989 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).