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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

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Article ID: JSA11121 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 1.0
Product Affected:
This issue affects Junos OS Evolved 19.4-EVO, 20.1-EVO, 20.2-EVO, 20.3-EVO.
Problem:

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.

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.

Solution:

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.

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
Modification History:
2021-04-14: Initial Publication.
CVSS Score:
7.1 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)
Severity Level:
High
Severity Assessment:
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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