On Juniper Networks Junos OS devices with Multipath or add-path feature enabled, processing a specific BGP UPDATE can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued receipt and processing of this UPDATE message will create a sustained Denial of Service (DoS) condition.

This BGP UPDATE message can propagate to other BGP peers with vulnerable Junos versions on which Multipath or add-path feature is enabled, and cause RPD to crash and restart.

This issue affects both IBGP and EBGP deployments in IPv4 or IPv6 network.

Junos OS devices that do not have the BGP Multipath or add-path feature enabled are not affected by this issue.

This issue affects:

Juniper Networks Junos OS:

• 12.3 versions prior to 12.3R12-S18;
• 15.1 versions prior to 15.1R7-S9;
• 17.3 versions prior to 17.3R3-S11;
• 17.4 versions prior to 17.4R2-S13, 17.4R3-S4;
• 18.1 versions prior to 18.1R3-S12;
• 18.2 versions prior to 18.2R3-S7;
• 18.3 versions prior to 18.3R3-S4;
• 18.4 versions prior to 18.4R2-S6, 18.4R3-S6;
• 19.1 versions prior to 19.1R3-S3.

The examples of the config stanza affected by this issue:

or

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-2021-0282 .
 

The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S18, 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 18.1R3-S12, 18.2R3-S7, 18.3R3-S4, 18.4R2-S6, 18.4R3-S6, 19.1R3-S3, 19.2R1, and all subsequent releases.

This issue is being tracked as 1412977 .
 

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

The BGP Multipath or add-path features can be disabled to mitigate this issue.
 

2021-07-14: 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 Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2021-0282: RPD crash while processing a specific BGP UPDATE when Multipath or add-path features are enabled