CVE-2021-0287: Junos OS and Junos OS Evolved: RPD could crash in SR-ISIS/MPLS environment due to a flap of an ISIS link in the network
First published: Thu Jul 15 2021(Updated: )
In a Segment Routing ISIS (SR-ISIS)/MPLS environment, on Juniper Networks Junos OS and Junos OS Evolved devices, configured with ISIS Flexible Algorithm for Segment Routing and sensor-based statistics, a flap of a ISIS link in the network, can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued link flaps will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 19.4 versions prior to 19.4R1-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S2, 20.2R3; 20.3 versions prior to 20.3R2; Juniper Networks Junos OS Evolved: 20.3-EVO versions prior to 20.3R2-EVO; 20.4-EVO versions prior to 20.4R2-EVO. This issue does not affect: Juniper Networks Junos OS releases prior to 19.4R1. Juniper Networks Junos OS Evolved releases prior to 19.4R1-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Junos OS Evolved | =19.4-r1 | |
| Junos OS Evolved | =19.4-r1-s1 | |
| Junos OS Evolved | =19.4-r1-s2 | |
| Junos OS Evolved | =19.4-r1-s3 | |
| Junos OS Evolved | =19.4-r2 | |
| Junos OS Evolved | =19.4-r2-s1 | |
| Junos OS Evolved | =19.4-r2-s2 | |
| Junos OS Evolved | =19.4-r2-s3 | |
| Junos OS Evolved | =19.4-r3 | |
| Junos OS Evolved | =19.4-r3-s1 | |
| Junos OS Evolved | =20.1-r1 | |
| Junos OS Evolved | =20.1-r1-s1 | |
| Junos OS Evolved | =20.1-r1-s2 | |
| Junos OS Evolved | =20.1-r1-s3 | |
| Junos OS Evolved | =20.1-r1-s4 | |
| Junos OS Evolved | =20.1-r2 | |
| Junos OS Evolved | =20.2-r1 | |
| Junos OS Evolved | =20.2-r1-s1 | |
| Junos OS Evolved | =20.2-r1-s2 | |
| Junos OS Evolved | =20.2-r1-s3 | |
| Junos OS Evolved | =20.2-r2 | |
| Junos OS Evolved | =20.2-r2-s1 | |
| Junos OS Evolved | =20.3-r1 | |
| Junos OS Evolved | =20.3-r1-s1 | |
| Juniper JUNOS | =20.3 | |
| Juniper JUNOS | =20.3-r1 | |
| Juniper JUNOS | =20.4-r1-s1 |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS: 19.4R1-S4, 19.4R3-S2, 20.1R2-S1, 20.1R3, 20.2R2-S2, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases. Junos OS Evolved: 20.3R2-EVO, 20.4R2-EVO, 21.1R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-0287?
CVE-2021-0287 has been classified with a high severity level due to its potential impact on Juniper Networks devices.
How do I fix CVE-2021-0287?
To fix CVE-2021-0287, upgrade to the fixed version of Junos OS specified in the vendor's advisory.
What devices are affected by CVE-2021-0287?
CVE-2021-0287 affects Juniper Networks Junos OS and Junos OS Evolved devices configured with ISIS Flexible Algorithm.
What is the risk of not addressing CVE-2021-0287?
Not addressing CVE-2021-0287 may lead to disruption in routing processes, potentially causing network instability.
Has a patch been released for CVE-2021-0287?
Yes, Juniper has released patches for CVE-2021-0287 in the later versions of Junos OS.
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