CVE-2021-0211

Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted.

Published Jan 15, 2021 CVSS 3.1 · 10 Critical EPSS 1.3% KEV · Not listed
Description
An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message thereby causing an unexpected change in the route advertisements within the BGP FlowSpec domain leading to disruptions in network traffic causing a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition. This issue affects Juniper Networks: Junos OS: All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX Series and 15.1R7-S8 on EX Series; 17.3 versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1; 19.4 versions prior to 19.4R1-S3, 19.4R2-S3, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2. Junos OS Evolved: All versions prior to 20.3R1-S1-EVO, 20.3R2-EVO.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: Junos OS: 15.1R7-S8, 15.1X49-D240, 17.3R3-S10, 17.4R2-S12, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S6, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R1-S3, 19.4R2-S3, 19.4R3, 20.1R2, 20.2R1-S3, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases. Junos OS Evolved: 20.3R1-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.


Vendor Workaround

There are no viable workarounds for this issue.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2021-2830 An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message thereby causing an unexpected change in the route advertisements within the BGP FlowSpec domain leading to disruptions in network traffic causing a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition. This issue affects Juniper Networks: Junos OS: All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX Series and 15.1R7-S8 on EX Series; 17.3 versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1; 19.4 versions prior to 19.4R1-S3, 19.4R2-S3, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2. Junos OS Evolved: All versions prior to 20.3R1-S1-EVO, 20.3R2-EVO.
References
History

No history.

Subscriptions

Juniper Ex2200 Ex2200-c Ex2200-vc Ex2300 Ex2300-c Ex2300m Ex3200 Ex3300 Ex3300-vc Ex3400 Ex4200 Ex4200-vc Ex4300 Ex4300-24p Ex4300-24p-s Ex4300-24t Ex4300-24t-s Ex4300-32f Ex4300-32f-dc Ex4300-32f-s Ex4300-48mp Ex4300-48mp-s Ex4300-48p Ex4300-48p-s Ex4300-48t Ex4300-48t-afi Ex4300-48t-dc Ex4300-48t-dc-afi Ex4300-48t-s Ex4300-48tafi Ex4300-48tdc Ex4300-48tdc-afi Ex4300-mp Ex4300-vc Ex4300m Ex4400 Ex4500 Ex4500-vc Ex4550 Ex4550-vc Ex4550\/vc Ex4600 Ex4600-vc Ex4650 Ex6200 Ex6210 Ex8200 Ex8200-vc Ex8208 Ex8216 Ex9200 Ex9204 Ex9208 Ex9214 Ex9250 Ex9251 Ex9253 Ex Rps Junos Junos Os Evolved Srx100 Srx110 Srx1400 Srx1500 Srx210 Srx220 Srx240 Srx240h2 Srx300 Srx320 Srx340 Srx3400 Srx345 Srx3600 Srx380 Srx4000 Srx4100 Srx4200 Srx4600 Srx5000 Srx5400 Srx550 Srx550 Hm Srx550m Srx5600 Srx5800 Srx650
Weaknesses

Sources

Status
PUBLISHED
Assigner
juniper
Published
Updated
Sep 16, 2024, 8:52 PM
Reserved
Oct 27, 2020, 12:00 AM
Status
Modified
Published
Jan 15, 2021, 6:15 PM
Modified
Jun 17, 2026, 3:29 AM