An Out-of-Bounds Write vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

On all Junos OS and Junos OS Evolved devices an rpd crash and restart can occur while processing BGP route updates received over an established BGP session. This specific issue is observed for BGP routes learned via a peer which is configured with a BGP import policy that has hundreds of terms matching IPv4 and/or IPv6 prefixes.

This issue affects Juniper Networks Junos OS:

• All versions prior to 20.4R3-S8;
• 21.1 version 21.1R1 and later versions;
• 21.2 versions prior to 21.2R3-S2;
• 21.3 versions prior to 21.3R3-S5;
• 21.4 versions prior to 21.4R2-S1, 21.4R3-S5.

This issue affects Juniper Networks Junos OS Evolved:

• All versions prior to 20.4R3-S8-EVO;
• 21.1-EVO version 21.1R1-EVO and later versions;
• 21.2-EVO versions prior to 21.2R3-S2-EVO;
• 21.3-EVO version 21.3R1-EVO and later versions;
• 21.4-EVO versions prior to 21.4R2-S1-EVO, 21.4R3-S5-EVO.

To be affected a device needs to be configured with at least one BGP peer and an import policy applicable to it which contains the respective match condition:

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2023-44197.

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

Junos OS: 20.4R3-S8, 21.2R3-S2, 21.3R3-S5, 21.4R2-S1, 21.4R3-S5, 22.1R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S8-EVO, 21.2R3-S2-EVO, 21.4R2-S1-EVO, 21.4R3-S5-EVO, 22.1R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1626717 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).

2023-10-11: 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-2023-44197 at cve.mitre.org
• https://supportportal.juniper.net/JSA73163 [juniper.net]