An Improper Validation of Specified Type of Input vulnerability in the packet forwarding engine (pfe) Juniper Networks Junos OS on SRX5000 Series allows an unauthenticated, network based attacker to cause a Denial of Service (Dos).

When a non-clustered SRX5000 device receives a specifically malformed packet this will cause a flowd crash and restart.

This issue affects Junos OS:

• 22.1 releases 22.1R1 and later before 22.2R3-S5,
• 22.3 releases before 22.3R3-S4,
• 22.4 releases before 22.4R3-S4,
• 23.2 releases before 23.2R2-S2,
• 23.4 releases before 23.4R2-S1,
• 24.2 releases before 24.2R1-S1, 24.2R2.

Please note that the PR does indicate that earlier versions have been fixed as well, but these won't be adversely impacted by this.

To be exposed to this issue the device must not be configured for clustering:

user@host> show chassis cluster status      
error: Chassis cluster is not enabled.

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

This issue was seen during production usage.

The following software releases have been updated to resolve this specific issue: 22.2R3-S5*, 22.3R3-S4*, 22.4R3-S4, 23.2R2-S2, 23.4R2-S1, 24.2R1-S1, 24.2R2*, 24.4R1*, and all subsequent releases.
(* future release)

This issue is being tracked as 1821452 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).

There are no known workarounds for this issue.

2024-10-09: Initial Publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team