An Improper Input Validation vulnerability in the routing protocol daemon (rpd) of Juniper Networks allows an attacker to cause a Denial of Service (DoS) to the device upon receiving and processing a specific malformed ISO VPN BGP UPDATE packet.

Continued receipt of this packet will cause a sustained Denial of Service condition.

This issue affects:
Juniper Networks Junos OS:

• All versions prior to 20.4R3-S6;
• 21.1 versions prior to 21.1R3-S5;
• 21.2 versions prior to 21.2R3-S4;
• 21.3 versions prior to 21.3R3-S3;
• 21.4 versions prior to 21.4R3-S3;
• 22.1 versions prior to 22.1R2-S2, 22.1R3;
• 22.2 versions prior to 22.2R2-S1, 22.2R3;
• 22.3 versions prior to 22.3R1-S2, 22.3R2.

Juniper Networks Junos OS Evolved:

• All versions prior to 20.4R3-S6-EVO;
• 21.1-EVO version 21.1R1-EVO and later versions prior to 21.2R3-S4-EVO;
• 21.3-EVO versions prior to 21.3R3-S3-EVO;
• 21.4-EVO versions prior to 21.4R3-S3-EVO;
• 22.1-EVO versions prior to 22.1R3-EVO;
• 22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO;
• 22.3-EVO versions prior to 22.3R1-S2-EVO, 22.3R2-EVO.

The following minimal configuration is required:

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-2023-44185.

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

Junos OS: 20.4R3-S6, 21.1R3-S5, 21.2R3-S4, 21.3R3-S3, 21.4R3-S3, 22.1R2-S2, 22.1R3, 22.2R2-S1, 22.2R3, 22.3R1-S2, 22.3R2, 22.4R1, and all subsequent releases.

Junos OS Evolved: 20.4R3-S6-EVO, 21.2R3-S4-EVO, 21.3R3-S3-EVO, 21.4R3-S3-EVO, 22.1R3-EVO, 22.2R2-S1-EVO, 22.2R3-EVO, 22.3R1-S2-EVO, 22.3R2-EVO, 22.4R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1699244 which is visible on the Customer Support website.

Note: Juniper SIRT's policy [juniper.net] is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

There are no known workarounds for this issue.

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-2023-44185 at cve.mitre.org
• https://kb.juniper.net/JSA73146 [juniper.net]

• Matteo Memelli from Amazon