CVE-2021-0226: Junos OS Evolved: The IPv6 BGP session will flap due to receipt of a specific IPv6 packet
First published: Thu Apr 22 2021(Updated: )
On Juniper Networks Junos OS Evolved devices, receipt of a specific IPv6 packet may cause an established IPv6 BGP session to terminate, creating a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue does not affect IPv4 BGP sessions. This issue affects IBGP or EBGP peer sessions with IPv6. This issue affects: Juniper Networks Junos OS Evolved: 19.4 versions prior to 19.4R2-S3-EVO; 20.1 versions prior to 20.1R2-S3-EVO; 20.2 versions prior to 20.2R2-S1-EVO; 20.3 versions prior to 20.3R2-EVO. This issue does not affect Juniper Networks Junos OS releases.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Networks Junos OS Evolved | =20.1-r1 | |
| Juniper Networks Junos OS Evolved | =20.1-r1-s1 | |
| Juniper Networks Junos OS Evolved | =20.1-r2 | |
| Juniper Networks Junos OS Evolved | =20.1-r2-s1 | |
| Juniper Networks Junos OS Evolved | =20.1-r2-s2 | |
| Juniper Networks Junos OS Evolved | =20.2-r1 | |
| Juniper Networks Junos OS Evolved | =20.2-r1-s1 | |
| Juniper Networks Junos OS Evolved | =20.2-r2 | |
| Juniper Networks Junos OS Evolved | =20.3-r1 | |
| Juniper Networks Junos OS Evolved | =20.3-r1-s1 |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 19.4R2-S3-EVO, 20.1R2-S3-EVO, 20.2R2-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is CVE-2021-0226?
CVE-2021-0226 is a vulnerability in Juniper Networks Junos OS Evolved that allows a specific IPv6 packet to terminate an established IPv6 BGP session, resulting in a Denial of Service (DoS) condition.
What are the affected versions for CVE-2021-0226?
Affected versions for CVE-2021-0226 include Junos OS Evolved 20.1-r1, 20.1-r2, 20.2-r1, and 20.3-r1 among others.
How do I fix CVE-2021-0226?
To fix CVE-2021-0226, it is recommended to upgrade to a non-vulnerable version of Junos OS Evolved as per Juniper's advisories.
What is the impact of CVE-2021-0226?
The impact of CVE-2021-0226 is a potential Denial of Service (DoS) condition that can be sustained through the continued receipt of the specific IPv6 packet.
How can I mitigate CVE-2021-0226?
Mitigation for CVE-2021-0226 involves filtering the offending IPv6 packets to prevent them from causing disruption to the BGP sessions.
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- agent/title
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- agent/references
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- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
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- agent/first-publish-date
- agent/event
- collector/nvd-index
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/tags
- agent/source
- vendor/juniper
- canonical/juniper networks junos os evolved
- version/juniper networks junos os evolved/20.1-r1
- version/juniper networks junos os evolved/20.1-r1-s1
- version/juniper networks junos os evolved/20.1-r2
- version/juniper networks junos os evolved/20.1-r2-s1
- version/juniper networks junos os evolved/20.1-r2-s2
- version/juniper networks junos os evolved/20.2-r1
- version/juniper networks junos os evolved/20.2-r1-s1
- version/juniper networks junos os evolved/20.2-r2
- version/juniper networks junos os evolved/20.3-r1
- version/juniper networks junos os evolved/20.3-r1-s1