An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).

If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
 

This issue affects Junos OS on SRX Series:

• 21.4 versions before 21.4R3-S7.9,
• 22.1 versions before 22.1R3-S5.3,
• 22.2 versions before 22.2R3-S4.11,
• 22.3 versions before 22.3R3,
• 22.4 versions before 22.4R3.

This issue affects Junos OS on NFX Series:

• 21.4 versions before 21.4R3-S8,
• 22.1 versions after 22.1R1,
• 22.2 versions before 22.2R3-S5,
• 22.3 versions before 22.3R3,
• 22.4 versions before 22.4R3.

The following software releases have been updated to resolve this specific issue:
SRX Series: 21.4R3-S7.9, 22.1R3-S5.3, 22.2R3-S4.11, 22.3R3, 22.4R3, 23.2R1, and all subsequent releases;
NFX Series: 21.4R3-S8, 22.2R3-S5*, 22.3R3, 22.4R3, 23.2R1, and all subsequent releases.
* Pending publication.

Please note that the software versions 21.4R3-S7.9, 22.1R3-S5.3 and 22.2R3-S4.11 are respins of previously released versions, so special attention needs to be paid to the last digits of the version number.

This issue is being tracked as 1719594 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).

2024-07-01: Initial Publication
2024-07-18: Updated to include NFX Series as affected with the resp. fixes. Added link to CVE at cve.org
2024-09-13: Minor formatting change to CVSS field

• 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
• https://www.cve.org/CVERecord?id=CVE-2024-21586