PT-2021-2136 · Juniper Networks · Junos

Published

2021-01-13

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Updated

2022-01-18

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CVE-2021-0211

CVSS v3.1

10

Critical

VectorAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
Name of the Vulnerable Software and Affected Versions Junos OS versions prior to 17.3R3-S10 Junos OS versions 17.3 prior to 17.3R3-S10 Junos OS versions 17.4 prior to 17.4R2-S12, 17.4R3-S4 Junos OS versions 18.1 prior to 18.1R3-S12 Junos OS versions 18.2 prior to 18.2R2-S8, 18.2R3-S6 Junos OS versions 18.3 prior to 18.3R3-S4 Junos OS versions 18.4 prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6 Junos OS versions 19.1 prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3 Junos OS versions 19.2 prior to 19.2R3-S1 Junos OS versions 19.3 prior to 19.3R2-S5, 19.3R3-S1 Junos OS versions 19.4 prior to 19.4R1-S3, 19.4R2-S3, 19.4R3 Junos OS versions 20.1 prior to 20.1R2 Junos OS versions 20.2 prior to 20.2R1-S3, 20.2R2 Junos OS versions 20.3 prior to 20.3R1-S1, 20.3R2 Junos OS Evolved versions prior to 20.3R1-S1-EVO, 20.3R2-EVO
Description An improper check for unusual or exceptional conditions in the Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message, causing an unexpected change in the route advertisements within the BGP FlowSpec domain, leading to disruptions in network traffic and a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition.
Recommendations For Junos OS versions prior to 17.3R3-S10, update to version 17.3R3-S10 or later. For Junos OS versions 17.3 prior to 17.3R3-S10, update to version 17.3R3-S10 or later. For Junos OS versions 17.4 prior to 17.4R2-S12, 17.4R3-S4, update to version 17.4R2-S12, 17.4R3-S4 or later. For Junos OS versions 18.1 prior to 18.1R3-S12, update to version 18.1R3-S12 or later. For Junos OS versions 18.2 prior to 18.2R2-S8, 18.2R3-S6, update to version 18.2R2-S8, 18.2R3-S6 or later. For Junos OS versions 18.3 prior to 18.3R3-S4, update to version 18.3R3-S4 or later. For Junos OS versions 18.4 prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, update to version 18.4R1-S8, 18.4R2-S6, 18.4R3-S6 or later. For Junos OS versions 19.1 prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3, update to version 19.1R1-S6, 19.1R2-S2, 19.1R3-S3 or later. For Junos OS versions 19.2 prior to 19.2R3-S1, update to version 19.2R3-S1 or later. For Junos OS versions 19.3 prior to 19.3R2-S5, 19.3R3-S1, update to version 19.3R2-S5, 19.3R3-S1 or later. For Junos OS versions 19.4 prior to 19.4R1-S3, 19.4R2-S3, 19.4R3, update to version 19.4R1-S3, 19.4R2-S3, 19.4R3 or later. For Junos OS versions 20.1 prior to 20.1R2, update to version 20.1R2 or later. For Junos OS versions 20.2 prior to 20.2R1-S3, 20.2R2, update to version 20.2R1-S3, 20.2R2 or later. For Junos OS versions 20.3 prior to 20.3R1-S1, 20.3R2, update to version 20.3R1-S1, 20.3R2 or later. For Junos OS Evolved versions prior to 20.3R1-S1-EVO, 20.3R2-EVO, update to version 20.3R1-S1-EVO, 20.3R2-EVO or later.

Fix

DoS

Improper Check for Exceptional Conditions

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Weakness Enumeration

CWE-754

Related Identifiers

BDU:2021-00995
CVE-2021-0211

Affected Products

Junos