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AUSCERT External Security Bulletin Redistribution
JSA11213 - 2021-10 Security Bulletin: Junos OS: Kernel crash (vmcore) upon
receipt of a malformed IPv6 packet (CVE-2021-0299)
15 October 2021
AusCERT Security Bulletin Summary
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2021-0299
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2021-10 Security Bulletin: Junos OS: Kernel crash (vmcore) upon receipt of a malformed IPv6 packet (CVE-2021-0299)
Article ID : JSA11213
Last Updated: 13 Oct 2021
Version : 1.0
This issue affects Junos OS 19.4, 20.1, 20.2.
An Improper Handling of Exceptional Conditions vulnerability in the processing
of a transit or directly received malformed IPv6 packet in Juniper Networks
Junos OS results in a kernel crash, causing the device to restart, leading to a
Denial of Service (DoS).
Continued receipt and processing of this packet will create a sustained Denial
of Service (DoS) condition.
This issue only affects systems with IPv6 configured. Devices with only IPv4
configured are not vulnerable to this issue.
This issue affects Juniper Networks Junos OS:
o 19.4 versions prior to 19.4R3;
o 20.1 versions prior to 20.1R2;
o 20.2 versions prior to 20.2R1-S1, 20.2R2.
This issue does not affect Juniper Networks Junos OS versions prior to 19.4R1.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was found during internal product security testing or research.
This issue has been assigned CVE-2021-0299 .
The following software releases have been updated to resolve this specific
issue: Junos OS 19.4R3, 20.1R2, 20.2R1-S1, 20.2R2, 20.3R1, and all subsequent
This issue is being tracked as 1515835 .
There are no viable workarounds for this issue.
Software releases or updates are available for download at https://
2021-10-13: 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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