An Improper Update of Reference Count vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to trigger a counter overflow, eventually causing a Denial of Service (DoS).
 

This issue affects Juniper Networks Junos OS Evolved:

• All versions prior to 20.4R3-S1-EVO;
• 21.1 versions prior to 21.1R3-EVO;
• 21.2 versions prior to 21.2R3-EVO;
• 21.3 versions prior to 21.3R2-EVO.

This issue does not affect Juniper Networks Junos OS.

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-2022-22195.

The following software releases have been updated to resolve this specific issue: 20.4R3-S1-EVO, 21.1R3-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1607769 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/

There are no viable workarounds for this issue.

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks, hosts and users.

• 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-2022-22195 at cve.mitre.org