CVE-2021-0280: Junos OS: PTX Series, QFX10K Series: Upon receipt of specific packets BFD sessions might flap due to DDoS policer implementation in Packet Forwarding Engine
Due to an Improper Initialization vulnerability in Juniper Networks Junos OS on PTX platforms and QFX10K Series with Paradise (PE) chipset-based line cards, ddos-protection configuration changes made from the CLI will not take effect as expected beyond the default DDoS (Distributed Denial of Service) settings in the Packet Forwarding Engine (PFE). This may cause BFD sessions to flap when a high rate of specific packets are received. Flapping of BFD sessions in turn may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only the following platforms with Paradise (PE) chipset-based line cards: PTX1000, PTX3000 (NextGen), PTX5000, PTX10008, PTX10016 Series and QFX10002 Series. This issue affects: Juniper Networks Junos OS 17.4 versions prior to 17.4R3-S5 on PTX Series, QFX10K Series; 18.2 versions prior to 18.2R3-S8 on PTX Series, QFX10K Series; 18.3 versions prior to 18.3R3-S5 on PTX Series, QFX10K Series; 18.4 versions prior to 18.4R2-S8 on PTX Series, QFX10K Series; 19.1 versions prior to 19.1R3-S5 on PTX Series, QFX10K Series; 19.2 versions prior to 19.2R3-S2 on PTX Series, QFX10K Series; 19.3 versions prior to 19.3R3-S2 on PTX Series, QFX10K Series; 19.4 versions prior to 19.4R3-S2 on PTX Series, QFX10K Series; 20.1 versions prior to 20.1R3 on PTX Series, QFX10K Series; 20.2 versions prior to 20.2R2-S3, 20.2R3 on PTX Series, QFX10K Series; 20.3 versions prior to 20.3R2 on PTX Series, QFX10K Series; 20.4 versions prior to 20.4R2 on PTX Series, QFX10K Series.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 17.4R3-S5 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 18.2R3-S8 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 18.3R3-S5 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 18.4R2-S8 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 19.1R3-S5 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 19.2R3-S2 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 19.3R3-S2 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 19.4R3-S2 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 20.1R3 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 20.2R2-S3 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 20.2R3 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 20.3R2 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 20.4R2 - Upgrade
Upgrade
Juniper Networks Junos OS (PTX Series / QFX10K Series on Paradise (PE) chipset-based line cards)to a version that resolves this vulnerability.Fixed in 21.1R1
Event History
Frequently Asked Questions
What is the severity of CVE-2021-0280?
CVE-2021-0280 has a medium severity rating due to its potential impact on DDoS protection functionality.
How do I fix CVE-2021-0280?
To mitigate CVE-2021-0280, upgrade your Junos OS to the latest version provided by Juniper Networks that addresses this vulnerability.
Which versions of Junos OS are affected by CVE-2021-0280?
CVE-2021-0280 affects Junos OS versions 17.4 and 18.2 to 20.4, among others.
What impact does CVE-2021-0280 have on users?
CVE-2021-0280 can result in ineffective DDoS protection configuration changes from the CLI.
Is there any workaround for CVE-2021-0280?
There is currently no known workaround for CVE-2021-0280, so upgrading is recommended.