In segment routing traffic engineering (SRTE) environments where the BGP Monitoring Protocol (BMP) feature is enable, a vulnerability in the Routing Protocol Daemon (RPD) process of Juniper Networks Junos OS allows an attacker to send a specific crafted BGP update message causing the RPD service to core, creating a Denial of Service (DoS) Condition.

Continued receipt and processing of this update message will create a sustained Denial of Service (DoS) condition.

This issue affects IPv4 and IPv6 environments.

This issue affects:

Juniper Networks Junos OS:

• 17.4 versions 17.4R1 and above prior to 17.4R2-S6, 17.4R3;
• 18.1 versions prior to 18.1R3-S7;
• 18.2 versions prior to 18.2R2-S6, 18.2R3-S3;
• 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3;
• 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3;
• 19.1 versions prior to 19.1R1-S4, 19.1R2;
• 19.2 versions prior to 19.2R1-S3, 19.2R2,

• This issue does not affect Junos OS releases prior to 17.4R1.

This issue affects:

• Juniper Networks Junos OS Evolved 19.2-EVO versions prior to 19.2R2-EVO.

This issue requires a SRTE topology using BGP with BGP Monitoring Protocol to be enabled.

For example:

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-2021-0250 .

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

Junos OS: 17.4R2-S6, 17.4R3, 18.1R3-S7, 18.2R2-S6, 18.2R3-S3, 18.3R1-S7, 18.3R2-S3, 18.3R3, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2, 19.2R1-S3, 19.2R2, 19.3R1, and all subsequent releases.

Junos OS Evolved: 19.2R2-EVO, and all subsequent releases.

This issue is being tracked as  1442721 .

Software releases or updates are available for download at https://support.juniper.net/support/downloads/

2021-04-14: 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-2021-0250 at cve.mitre.org