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AUSCERT External Security Bulletin Redistribution
JSA11121 - 2021-04 Security Bulletin: Junos OS Evolved: The IPv6 BGP
session will flap due to receipt of a specific IPv6 packet
15 April 2021
AusCERT Security Bulletin Summary
Product: Junos OS Evolved: IPv6 BGP
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2021-0226
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2021-04 Security Bulletin: Junos OS Evolved: The IPv6 BGP session will flap due to receipt of a specific IPv6 packet
Article ID : JSA11121
Last Updated: 14 Apr 2021
Version : 1.0
This issue affects Junos OS Evolved 19.4-EVO, 20.1-EVO, 20.2-EVO, 20.3-EVO.
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:
o 19.4 versions prior to 19.4R2-S3-EVO;
o 20.1 versions prior to 20.1R2-S3-EVO;
o 20.2 versions prior to 20.2R2-S1-EVO;
o 20.3 versions prior to 20.3R2-EVO.
This issue does not affect Juniper Networks Junos OS releases.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2021-0226 .
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.
This issue is being tracked as 1544978 .
There are no viable workarounds for this issue.
Software releases or updates are available for download at https://
2021-04-14: Initial Publication.
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
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