high
7.5
CWE
362 416
Advisory Published
Updated

CVE-2021-0270: Junos OS: PTX Series, QFX10K Series: A PTX/QFX FPC may restart unexpectedly with the "inline-Jflow" feature enabled on a large-scale deployment

First published: Thu Apr 22 2021(Updated: )

On PTX Series and QFX10k Series devices with the "inline-jflow" feature enabled, a use after free weakness in the Packet Forwarding Engine (PFE) microkernel architecture of Juniper Networks Junos OS may allow an attacker to cause a Denial of Service (DoS) condition whereby one or more Flexible PIC Concentrators (FPCs) may restart. As this is a race condition situation this issue become more likely to be hit when network instability occurs, such as but not limited to BGP/IGP reconvergences, and/or further likely to occur when more active "traffic flows" are occurring through the device. When this issue occurs, it will cause one or more FPCs to restart unexpectedly. During FPC restarts core files will be generated. While the core file is generated traffic will be disrupted. Sustained receipt of large traffic flows and reconvergence-like situations may sustain the Denial of Service (DoS) situation. This issue affects: Juniper Networks Junos OS: 18.1 version 18.1R2 and later versions prior to 18.1R3-S10 on PTX Series, QFX10K Series.

Credit: sirt@juniper.net

Affected SoftwareAffected VersionHow to fix
Juniper JUNOS=18.1-r2
Juniper JUNOS=18.1-r2-s1
Juniper JUNOS=18.1-r2-s2
Juniper JUNOS=18.1-r2-s4
Juniper JUNOS=18.1-r3
Juniper JUNOS=18.1-r3-s1
Juniper JUNOS=18.1-r3-s2
Juniper JUNOS=18.1-r3-s3
Juniper JUNOS=18.1-r3-s4
Juniper JUNOS=18.1-r3-s5
Juniper JUNOS=18.1-r3-s6
Juniper JUNOS=18.1-r3-s7
Juniper JUNOS=18.1-r3-s8
Juniper JUNOS=18.1-r3-s9
Juniper Ptx1000
Juniper Ptx10001-36mr
Juniper Ptx10002
Juniper Ptx10003
Juniper Ptx10004
Juniper Ptx10008
Juniper Ptx10016
Juniper Ptx3000
Juniper Ptx5000
Juniper Qfx10002
Juniper Qfx10008
Juniper Qfx10016

Remedy

The following software releases have been updated to resolve this specific issue: 16.1R7-S8, 17.2R3-S4, 17.3R3-S8, 17.4R2-S11, 17.4R3-S2, 18.1R3-S10, 18.2R1, and all subsequent releases.

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2021-0270.

  • What is the severity level of CVE-2021-0270?

    CVE-2021-0270 has a severity level of high.

  • Which devices are affected by CVE-2021-0270?

    PTX Series and QFX10k Series devices with the "inline-jflow" feature enabled are affected by CVE-2021-0270.

  • What is the impact of CVE-2021-0270?

    CVE-2021-0270 may allow an attacker to cause a Denial of Service (DoS) condition on the affected devices.

  • How can I mitigate CVE-2021-0270?

    To mitigate CVE-2021-0270, it is recommended to disable the "inline-jflow" feature on the affected devices.

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