An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).

If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.

This issue affects Juniper Networks
Junos OS:

• 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
• 21.2 versions earlier than 21.2R3-S7;
• 21.3 versions earlier than 21.3R3-S5;
• 21.4 versions earlier than 21.4R3-S5;
• 22.1 versions earlier than 22.1R3-S4;
• 22.2 versions earlier than 22.2R3-S3;
• 22.3 versions earlier than 22.3R3-S1;
• 22.4 versions earlier than 22.4R3;
• 23.2 versions earlier than 23.2R1-S2, 23.2R2;

• 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
• 21.2-EVO versions earlier than 21.2R3-S7-EVO;
• 21.3-EVO versions earlier than 21.3R3-S5-EVO;
• 21.4-EVO versions earlier than 21.4R3-S5-EVO;
• 22.1-EVO versions earlier than 22.1R3-S4-EVO;
• 22.2-EVO versions earlier than 22.2R3-S3-EVO;
• 22.3-EVO versions earlier than 22.3R3-S1-EVO;
• 22.4-EVO versions earlier than 22.4R3-EVO;
• 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;

• Junos OS versions earlier than 20.4R1;
• Junos OS Evolved versions earlier than 20.4R1-EVO.

This is a related but separate issue than the one described in JSA79095 [juniper.net].

To be exposed to this vulnerability BGP needs to be configured as in the following example, but no further options need to be enabled:

 [ protocols bgp group <group> neighbor ... ]

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

Junos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R3, 23.2R1-S2, 23.2R2, 23.4R1, and all subsequent releases;

Junos OS Evolved: 20.4R3-S9-EVO, 21.2R3-S7-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R1-S2-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1760356 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).

2024-09-13: Minor formatting change to cvss field.
2024-04-10: 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
• https://www.cve.org/CVERecord?id=CVE-2024-21598