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

Updated

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.

Affected Software

336 affected components

Juniper Junos=17.3

Juniper Junos=17.3-r1-s1

Juniper Junos=17.3-r2

Juniper Junos=17.3-r2-s1

Juniper Junos=17.3-r2-s2

Juniper Junos=17.3-r2-s3

Juniper Junos=17.3-r2-s4

Juniper Junos=17.3-r2-s5

Juniper Junos=17.3-r3

Juniper Junos=17.3-r3-s1

Juniper Junos=17.3-r3-s2

Juniper Junos=17.3-r3-s3

Juniper Junos=17.3-r3-s4

Juniper Junos=17.3-r3-s7

Juniper Junos=17.3-r3-s8

Juniper Junos=17.3-r3-s9

Juniper Junos=17.4

Juniper Junos=17.4-r1

Juniper Junos=17.4-r1-s1

Juniper Junos=17.4-r1-s2

Juniper Junos=17.4-r1-s4

Juniper Junos=17.4-r1-s5

Juniper Junos=17.4-r1-s6

Juniper Junos=17.4-r1-s7

Juniper Junos=17.4-r2

Juniper Junos=17.4-r2-s1

Juniper Junos=17.4-r2-s10

Juniper Junos=17.4-r2-s11

Juniper Junos=17.4-r2-s2

Juniper Junos=17.4-r2-s3

Juniper Junos=17.4-r2-s4

Juniper Junos=17.4-r2-s5

Juniper Junos=17.4-r2-s6

Juniper Junos=17.4-r2-s7

Juniper Junos=17.4-r2-s8

Juniper Junos=17.4-r2-s9

Juniper Junos=17.4-r3

Juniper Junos=17.4-r3-s1

Juniper Junos=17.4-r3-s2

Juniper Junos=17.4-r3-s3

Juniper Junos=18.1

Juniper Junos=18.1-r1

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-s10

Juniper Junos=18.1-r3-s11

Juniper Junos=18.1-r3-s2

Juniper Junos=18.1-r3-s3

Juniper Junos=18.1-r3-s4

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 Junos=18.2

Juniper Junos=18.2-r1

Juniper Junos=18.2-r1-s3

Juniper Junos=18.2-r1-s4

Juniper Junos=18.2-r1-s5

Juniper Junos=18.2-r2

Juniper Junos=18.2-r2-s1

Juniper Junos=18.2-r2-s2

Juniper Junos=18.2-r2-s3

Juniper Junos=18.2-r2-s4

Juniper Junos=18.2-r2-s5

Juniper Junos=18.2-r2-s6

Juniper Junos=18.2-r2-s7

Juniper Junos=18.3

Juniper Junos=18.3-r1

Juniper Junos=18.3-r1-s1

Juniper Junos=18.3-r1-s2

Juniper Junos=18.3-r1-s3

Juniper Junos=18.3-r1-s5

Juniper Junos=18.3-r1-s6

Juniper Junos=18.3-r2

Juniper Junos=18.3-r2-s1

Juniper Junos=18.3-r2-s2

Juniper Junos=18.3-r2-s3

Juniper Junos=18.3-r2-s4

Juniper Junos=18.3-r3

Juniper Junos=18.3-r3-s1

Juniper Junos=18.3-r3-s2

Juniper Junos=18.3-r3-s3

Juniper Junos=18.4

Juniper Junos=18.4-r1

Juniper Junos=18.4-r1-s1

Juniper Junos=18.4-r1-s2

Juniper Junos=18.4-r1-s3

Juniper Junos=18.4-r1-s4

Juniper Junos=18.4-r1-s5

Juniper Junos=18.4-r1-s6

Juniper Junos=18.4-r1-s7

Juniper Junos=18.4-r2

Juniper Junos=18.4-r2-s1

Juniper Junos=18.4-r2-s2

Juniper Junos=18.4-r2-s3

Juniper Junos=18.4-r2-s4

Juniper Junos=18.4-r2-s5

Juniper Junos=18.4-r3

Juniper Junos=18.4-r3-s1

Juniper Junos=18.4-r3-s2

Juniper Junos=18.4-r3-s3

Juniper Junos=18.4-r3-s4

Juniper Junos=18.4-r3-s5

Juniper Junos=19.1

Juniper Junos=19.1-r1

Juniper Junos=19.1-r1-s1

Juniper Junos=19.1-r1-s2

Juniper Junos=19.1-r1-s3

Juniper Junos=19.1-r1-s4

Juniper Junos=19.1-r1-s5

Juniper Junos=19.1-r2

Juniper Junos=19.1-r2-s1

Juniper Junos=19.1-r3

Juniper Junos=19.1-r3-s1

Juniper Junos=19.1-r3-s2

Juniper Junos=19.2

Juniper Junos=19.2-r1

Juniper Junos=19.2-r1-s1

Juniper Junos=19.2-r1-s2

Juniper Junos=19.2-r1-s3

Juniper Junos=19.2-r1-s4

Juniper Junos=19.2-r2

Juniper Junos=19.2-r3

Juniper Junos=19.3

Juniper Junos=19.3-r1

Juniper Junos=19.3-r1-s1

Juniper Junos=19.3-r2

Juniper Junos=19.3-r2-s1

Juniper Junos=19.3-r2-s2

Juniper Junos=19.3-r2-s3

Juniper Junos=19.3-r2-s4

Juniper Junos=19.3-r3

Juniper Junos=19.4-r1

Juniper Junos=19.4-r1-s1

Juniper Junos=19.4-r1-s2

Juniper Junos=19.4-r2

Juniper Junos=19.4-r2-s1

Juniper Junos=19.4-r2-s2

Juniper Junos=20.1-r1

Juniper Junos=20.1-r1-s1

Juniper Junos=20.1-r1-s2

Juniper Junos=20.1-r1-s3

Juniper Junos=20.2-r1

Juniper Junos=20.2-r1-s1

Juniper Junos=20.2-r1-s2

Juniper Junos=20.3-r1

Juniper Junos OS Evolved=19.2-r1

Juniper Junos OS Evolved=19.2-r2

Juniper Junos OS Evolved=19.3-r2

Juniper Junos OS Evolved=19.4-r1

Juniper Junos OS Evolved=19.4-r2

Juniper Junos OS Evolved=19.4-r2-s1

Juniper Junos OS Evolved=20.1

Juniper Junos OS Evolved=20.1-r1

Juniper Junos OS Evolved=20.2

Juniper Junos OS Evolved=20.3-r1

Juniper Junos=15.1x49

Juniper Junos=15.1x49-d10

Juniper Junos=15.1x49-d100

Juniper Junos=15.1x49-d110

Juniper Junos=15.1x49-d120

Juniper Junos=15.1x49-d130

Juniper Junos=15.1x49-d131

Juniper Junos=15.1x49-d140

Juniper Junos=15.1x49-d15

Juniper Junos=15.1x49-d150

Juniper Junos=15.1x49-d160

Juniper Junos=15.1x49-d170

Juniper Junos=15.1x49-d180

Juniper Junos=15.1x49-d190

Juniper Junos=15.1x49-d20

Juniper Junos=15.1x49-d200

Juniper Junos=15.1x49-d210

Juniper Junos=15.1x49-d25

Juniper Junos=15.1x49-d30

Juniper Junos=15.1x49-d35

Juniper Junos=15.1x49-d40

Juniper Junos=15.1x49-d45

Juniper Junos=15.1x49-d50

Juniper Junos=15.1x49-d55

Juniper Junos=15.1x49-d60

Juniper Junos=15.1x49-d65

Juniper Junos=15.1x49-d70

Juniper Junos=15.1x49-d75

Juniper Junos=15.1x49-d80

Juniper Junos=15.1x49-d90

Juniper Junos=15.1x49-d30

Juniper Junos=15.1x49-d60

Juniper Junos=15.1x49-d140

Juniper Junos=15.1x49-d150

Juniper Junos=15.1x49-d160

Juniper SRX100

Juniper SRX110

Juniper SRX1400

Juniper SRX1500

Juniper SRX210

Juniper SRX220

Juniper SRX240

Juniper Srx240h2

Juniper SRX300

Juniper SRX320

Juniper SRX340

Juniper SRX3400

Juniper SRX345

Juniper SRX3600

Juniper Srx380

Juniper SRX4000

Juniper SRX4100

Juniper SRX4200

Juniper SRX4600

Juniper SRX5000

Juniper SRX5400

Juniper SRX550

Juniper Srx550 Hm

Juniper SRX550m

Juniper SRX5600

Juniper SRX5800

Juniper SRX650

Juniper Junos=15.1

Juniper Junos=15.1-a1

Juniper Junos=15.1-f

Juniper Junos=15.1-f1

Juniper Junos=15.1-f2

Juniper Junos=15.1-f2-s1

Juniper Junos=15.1-f2-s2

Juniper Junos=15.1-f2-s3

Juniper Junos=15.1-f2-s4

Juniper Junos=15.1-f3

Juniper Junos=15.1-f4

Juniper Junos=15.1-f5

Juniper Junos=15.1-f5-s7

Juniper Junos=15.1-f6

Juniper Junos=15.1-f6-s1

Juniper Junos=15.1-f6-s10

Juniper Junos=15.1-f6-s12

Juniper Junos=15.1-f6-s2

Juniper Junos=15.1-f6-s3

Juniper Junos=15.1-f6-s4

Juniper Junos=15.1-f6-s5

Juniper Junos=15.1-f6-s6

Juniper Junos=15.1-f6-s7

Juniper Junos=15.1-f6-s8

Juniper Junos=15.1-f6-s9

Juniper Junos=15.1-f7

Juniper Junos=15.1-r

Juniper Junos=15.1-r1

Juniper Junos=15.1-r2

Juniper Junos=15.1-r3

Juniper Junos=15.1-r4

Juniper Junos=15.1-r4-s7

Juniper Junos=15.1-r4-s8

Juniper Junos=15.1-r4-s9

Juniper Junos=15.1-r5

Juniper Junos=15.1-r5-s1

Juniper Junos=15.1-r5-s3

Juniper Junos=15.1-r5-s5

Juniper Junos=15.1-r5-s6

Juniper Junos=15.1-r6

Juniper Junos=15.1-r6-s1

Juniper Junos=15.1-r6-s2

Juniper Junos=15.1-r6-s3

Juniper Junos=15.1-r6-s4

Juniper Junos=15.1-r6-s6

Juniper Junos=15.1-r7

Juniper Junos=15.1-r7-s1

Juniper Junos=15.1-r7-s10

Juniper Junos=15.1-r7-s11

Juniper Junos=15.1-r7-s2

Juniper Junos=15.1-r7-s3

Juniper Junos=15.1-r7-s4

Juniper Junos=15.1-r7-s5

Juniper Junos=15.1-r7-s6

Juniper Junos=15.1-r7-s7

Juniper Ex Rps

Juniper EX2200

Juniper EX2200-C

Juniper Ex2200-vc

Juniper EX2300

Juniper EX2300-C

Juniper Ex2300m

Juniper EX3200

Juniper EX3300

Juniper Ex3300-vc

Juniper EX3400

Juniper EX4200

Juniper Ex4200-vc

Juniper EX4300

Juniper Ex4300-24p

Juniper Ex4300-24p-s

Juniper Ex4300-24t

Juniper Ex4300-24t-s

Juniper Ex4300-32f

Juniper Ex4300-32f-dc

Juniper Ex4300-32f-s

Juniper Ex4300-48mp

Juniper Ex4300-48mp-s

Juniper Ex4300-48p

Juniper Ex4300-48p-s

Juniper Ex4300-48t

Juniper Ex4300-48t-afi

Juniper Ex4300-48t-dc

Juniper Ex4300-48t-dc-afi

Juniper Ex4300-48t-s

Juniper Ex4300-48tafi

Juniper Ex4300-48tdc

Juniper Ex4300-48tdc-afi

Juniper EX4300-MP

Juniper Ex4300-vc

Juniper Ex4300m

Juniper EX4400

Juniper EX4500

Juniper Ex4500-vc

Juniper EX4550

Juniper Ex4550-vc

Juniper Ex4550\/vc

Juniper EX4600

Juniper Ex4600-vc

Juniper EX4650

Juniper EX6200

Juniper EX6210

Juniper EX8200

Juniper Ex8200-vc

Juniper EX8208

Juniper EX8216

Juniper EX9200

Juniper Ex9204

Juniper Ex9208

Juniper Ex9214

Juniper Ex9250

Juniper EX9251

Juniper Ex9253

Remediation

Information

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.

Event History

Jan 15, 2021

CVE Published

via MITRE·05:35 PM

Data Sourced

via MITRE·05:35 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2021-0211?

CVE-2021-0211 has been rated as a high-severity vulnerability, posing significant risk to affected systems.

How do I fix CVE-2021-0211?

To fix CVE-2021-0211, update the Juniper Networks Junos OS to the latest patched version that addresses this vulnerability.

What systems are impacted by CVE-2021-0211?

CVE-2021-0211 affects multiple versions of Juniper Networks Junos OS, particularly 17.3, 17.4, and 18.x series.

Can CVE-2021-0211 be exploited remotely?

Yes, CVE-2021-0211 can be exploited remotely by attackers if they send crafted BGP FlowSpec messages.

What are the consequences of CVE-2021-0211 exploitation?

Exploitation of CVE-2021-0211 can lead to unexpected modifications in BGP route advertisements, potentially disrupting network traffic.