A kernel memory leak in QFX10002-32Q, QFX10002-60C, QFX10002-72Q, QFX10008, QFX10016 devices Flexible PIC Concentrators (FPCs) on Juniper Networks Junos OS allows an attacker to send genuine packets destined to the device to cause a Denial of Service (DoS) to the device.

On QFX10002-32Q, QFX10002-60C, QFX10002-72Q devices the device will crash and restart.

On QFX10008, QFX10016 devices, depending on the number of FPCs involved in an attack, one more more FPCs may crash and traffic through the device may be degraded in other ways, until the attack traffic stops.

A reboot is required to restore service and clear the kernel memory.

Continued receipt and processing of these genuine packets will create a sustained Denial of Service (DoS) condition.

On QFX10008, QFX10016 devices, an indicator of compromise may be the existence of DCPFE core files.

You can also monitor PFE memory utilization for incremental growth:

This issue affects:

Juniper Networks Junos OS on QFX10002-32Q, QFX10002-60C, QFX10002-72Q, QFX10008, QFX10016:

• 16.1 versions 16.1R1 and above prior to 17.3 versions prior to 17.3R3-S9;
• 17.4 versions prior to 17.4R3-S2;
• 18.1 versions prior to 18.1R3-S11;
• 18.2 versions prior to 18.2R3-S5;
• 18.3 versions prior to 18.3R3-S3;
• 18.4 versions prior to 18.4R2-S5, 18.4R3-S4;
• 19.1 versions prior to 19.1R3-S2;
• 19.2 versions prior to 19.2R3;
• 19.3 versions prior to 19.3R3;
• 19.4 versions prior to 19.4R3;
• 20.1 versions prior to 20.1R2.

• This issue does not affect releases prior to Junos OS 16.1R1.

This issue does not affect EX Series devices.

This issue does not affect Junos OS Evolved.

This issue occurs in composite next hop EVPN-VXLAN scenarios, chained-composite-next-hop (CHN) being configured is not a requirement but can still affect EVPN pure type 5 with VXLAN encapsulation deployments.

See https://kb.juniper.net/KB32854 [juniper.net] for further configuration details.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing or research.

This issue has been assigned  CVE-2021-0272 .

The following software releases have been updated to resolve this specific issue: 17.3R3-S9, 17.4R3-S2, 18.1R3-S11, 18.2R3-S5, 18.3R3-S3, 18.4R2-S5, 18.4R3-S4, 19.1R3-S2, 19.2R3, 19.3R3, 19.4R3, 20.1R2, 20.2R1, and all subsequent releases.

This issue is being tracked as  1486614 .

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-2021-0272 at cve.mitre.org