An Exposure of Resource to Wrong Sphere vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX 300 Series allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).

Specific valid link-local traffic is not blocked on ports in STP blocked state but is instead sent to the control plane of the device. This leads to excessive resource consumption and in turn severe impact on all control and management protocols of the device.

This issue affects Juniper Networks Junos OS:

• 21.2 version 21.2R3-S3 and later versions earlier than 21.2R3-S6;
• 22.1 version 22.1R3 and later versions earlier than 22.1R3-S4;
• 22.2 version 22.2R2 and later versions earlier than 22.2R3-S2;
• 22.3 version 22.3R2 and later versions earlier than 22.3R3-S1;
• 22.4 versions earlier than 22.4R2-S2, 22.4R3;
• 23.2 versions earlier than 23.2R1-S1, 23.2R2.

  [protocols (stp | mstp | rstp | vstp) interface <interface>]

The following software releases have been updated to resolve this specific issue: 21.2R3-S6, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 23.4R1, and all subsequent releases.

This issue is being tracked as 1706933 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).

2024-09-13: Minor formatting change to cvss field.
2024-04-10: 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
• supportportal.juniper.net/JSA75746 [juniper.net]
• https://www.cve.org/CVERecord?id=CVE-2024-21605