A Use After Free vulnerability in the routing protocol daemon of Juniper Networks Junos OS and Junos OS Evolved allows a locally authenticated attacker with low privileges to cause Denial of Service (DoS).

In a rib sharding scenario the rpd process will crash shortly after specific CLI command is issued. This issue is more likely to occur in a scenario with high route scale (>1M routes).

This issue affects:

Juniper Networks Junos OS

20.2 version 20.2R3-S5 and later versions prior to 20.2R3-S6;

20.3 version 20.3R3-S2 and later versions prior to 20.3R3-S5;

20.4 version 20.4R3-S1 and later versions prior to 20.4R3-S4

21.1 version 21.1R3 and later versions prior to 21.1R3-S3;

21.2 version 21.2R1-S2, 21.2R2-S1 and later versions prior to 21.2R3-S2;

21.3 version 21.3R2 and later versions prior to 21.3R3;

21.4 versions prior to 21.4R2-S1, 21.4R3;

22.1 versions prior to 22.1R2.

Juniper Networks Junos OS Evolved

20.4-EVO version 20.4R3-S1-EVO and later versions prior to 20.4R3-S6-EVO;

21.2-EVO version 21.2R1-S2-EVO and later versions prior to 21.2R3-S4-EVO;

21.3-EVO version 21.3R2-EVO and later versions prior to 21.3R3-S1-EVO;

21.4-EVO versions prior to 21.4R2-S1-EVO, 21.4R3-EVO;

22.1-EVO versions prior to 22.1R2-EVO.

To be exposed to this issue the system needs to be configured with rib sharding as follows:

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-2023-28980.

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

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

Junos OS: 20.2R3-S6, 20.3R3-S5, 20.4R3-S4, 21.1R3-S3, 21.2R3-S2, 21.3R3, 21.4R2-S1, 21.4R3, 22.1R2, 22.2R1, and all subsequent releases.

This issue is being tracked as 1658834

Note: Juniper SIRT's policy 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.

To reduce the risk of exploitation use access controls to limit CLI access to the device only from trusted networks, hosts and users.

• 2023-04-12: 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-2023-28980 at cve.mitre.org