CVE-2021-0299: Junos OS: Kernel crash (vmcore) upon receipt of a malformed IPv6 packet
First published: Wed Oct 13 2021(Updated: )
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: 19.4 versions prior to 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S1, 20.2R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.4R1.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Junos | =19.4 | |
| Juniper Junos | =19.4-r1 | |
| Juniper Junos | =19.4-r1-s1 | |
| Juniper Junos | =19.4-r1-s2 | |
| Juniper Junos | =19.4-r1-s3 | |
| Juniper Junos | =19.4-r1-s4 | |
| Juniper Junos | =19.4-r2 | |
| Juniper Junos | =19.4-r2-s1 | |
| Juniper Junos | =19.4-r2-s2 | |
| Juniper Junos | =19.4-r2-s3 | |
| Juniper Junos | =19.4-r2-s4 | |
| Juniper Junos | =19.4-r2-s5 | |
| Juniper Junos | =20.1-r1 | |
| Juniper Junos | =20.1-r1-s1 | |
| Juniper Junos | =20.1-r1-s2 | |
| Juniper Junos | =20.1-r1-s3 | |
| Juniper Junos | =20.1-r1-s4 | |
| Juniper Junos | =20.2-r1 |
Remedy
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 releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-0299?
CVE-2021-0299 is considered a high severity vulnerability due to its potential to cause Denial of Service (DoS).
How do I fix CVE-2021-0299?
To mitigate CVE-2021-0299, update your Junos OS to a fixed version as recommended in the security advisories.
Which versions of Junos OS are affected by CVE-2021-0299?
CVE-2021-0299 affects various 19.4 and 20.1 versions of Junos OS.
What type of vulnerability is CVE-2021-0299?
CVE-2021-0299 is an Improper Handling of Exceptional Conditions vulnerability.
What impact does CVE-2021-0299 have on systems?
CVE-2021-0299 can cause a kernel crash, leading to device restarts and service disruptions.
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- version/juniper junos/19.4
- version/juniper junos/19.4-r1
- version/juniper junos/19.4-r1-s1
- version/juniper junos/19.4-r1-s2
- version/juniper junos/19.4-r1-s3
- version/juniper junos/19.4-r1-s4
- version/juniper junos/19.4-r2
- version/juniper junos/19.4-r2-s1
- version/juniper junos/19.4-r2-s2
- version/juniper junos/19.4-r2-s3
- version/juniper junos/19.4-r2-s4
- version/juniper junos/19.4-r2-s5
- version/juniper junos/20.1-r1
- version/juniper junos/20.1-r1-s1
- version/juniper junos/20.1-r1-s2
- version/juniper junos/20.1-r1-s3
- version/juniper junos/20.1-r1-s4
- version/juniper junos/20.2-r1