An Improper Check for Unusual or Exceptional Conditions vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker with an established ISIS adjacency to cause a Denial of Service (DoS).
 

The rpd CPU spikes to 100% after a malformed ISIS TLV has been received which will lead to processing issues of routing updates and in turn traffic impact.
 

This issue affects:

Juniper Networks Junos OS

• 19.3 versions prior to 19.3R3-S4;
• 19.4 versions prior to 19.4R2-S6, 19.4R3-S6;
• 20.1 versions prior to 20.1R3-S2;
• 20.2 versions prior to 20.2R3-S3;
• 20.3 versions prior to 20.3R3-S1;
• 20.4 versions prior to 20.4R3;
• 21.1 versions prior to 21.1R3;
• 21.2 versions prior to 21.2R2.

Juniper Networks Junos OS Evolved

• All versions prior to 20.4R3-S3-EVO;
• 21.2 versions prior to 21.2R2-EVO.

This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.

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

This issue was seen during production usage.
 

This issue has been assigned CVE-2022-22196.

The following software releases have been updated to resolve this specific issue:

Junos OS: 19.3R3-S4, 19.4R2-S6, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S3-EVO, 21.2R2-EVO, 21.3R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1610983 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).
 

Implementation:

Software Releases, patches and updates are available at https://support.juniper.net/support/downloads/

• 2022-04-13: 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
• CVE-2022-22196 at cve.mitre.org