CVE-2020-1638: Junos OS & Junos OS Evolved: A specific IPv4 packet can lead to FPC restart.
First published: Wed Apr 08 2020(Updated: )
The FPC (Flexible PIC Concentrator) of Juniper Networks Junos OS and Junos OS Evolved may restart after processing a specific IPv4 packet. Only packets destined to the device itself, successfully reaching the RE through existing edge and control plane filtering, will be able to cause the FPC restart. When this issue occurs, all traffic via the FPC will be dropped. By continuously sending this specific IPv4 packet, an attacker can repeatedly crash the FPC, causing an extended Denial of Service (DoS) condition. This issue can only occur when processing a specific IPv4 packet. IPv6 packets cannot trigger this issue. This issue affects: Juniper Networks Junos OS on MX Series with MPC10E or MPC11E and PTX10001: 19.2 versions prior to 19.2R1-S4, 19.2R2; 19.3 versions prior to 19.3R2-S2, 19.3R3; 19.4 versions prior to 19.4R1-S1, 19.4R2. Juniper Networks Junos OS Evolved on on QFX5220, and PTX10003 series: 19.2-EVO versions; 19.3-EVO versions; 19.4-EVO versions prior to 19.4R2-EVO. This issue does not affect Junos OS versions prior to 19.2R1. This issue does not affect Junos OS Evolved versions prior to 19.2R1-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper JUNOS | =19.2 | |
| Juniper JUNOS | =19.2-r1 | |
| Juniper JUNOS | =19.2-r1-s1 | |
| Juniper JUNOS | =19.2-r1-s2 | |
| Juniper JUNOS | =19.2-r1-s3 | |
| Juniper JUNOS | =19.3-r1 | |
| Juniper JUNOS | =19.3-r1-s1 | |
| Juniper JUNOS | =19.3-r2 | |
| Juniper JUNOS | =19.3-r2-s1 | |
| Juniper JUNOS | =19.4-r1 | |
| Juniper Mx10003 | ||
| Juniper Mx2008 | ||
| Juniper Mx2010 | ||
| Juniper Mx2020 | ||
| Juniper Mx240 | ||
| Juniper Mx480 | ||
| Juniper Mx960 | ||
| Juniper Junos Os Evolved | =19.2-r1 | |
| Juniper Junos Os Evolved | =19.3-r2 | |
| Juniper Junos Os Evolved | =19.4-r1 | |
| Juniper Ptx10003 | ||
| Juniper Qfx5220 |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS: 19.2R1-S4, 19.2R2, 19.3R2-S2, 19.3R3, 19.4R1-S1, 19.4R2, 20.1R1, and all subsequent releases. Junos OS Evolved: 19.4R2-EVO, 20.1R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-1638?
The severity of CVE-2020-1638 is high, with a severity value of 7.5.
How does CVE-2020-1638 affect Juniper Networks Junos OS and Junos OS Evolved?
CVE-2020-1638 may cause the FPC (Flexible PIC Concentrator) to restart after processing a specific IPv4 packet in Juniper Networks Junos OS and Junos OS Evolved.
Which versions of Juniper Networks Junos OS and Junos OS Evolved are affected by CVE-2020-1638?
The following versions of Juniper Networks Junos OS and Junos OS Evolved are affected: 19.2, 19.2-r1, 19.2-r1-s1, 19.2-r1-s2, 19.2-r1-s3, 19.3-r1, 19.3-r1-s1, 19.3-r2, 19.3-r2-s1, 19.4-r1, 19.2-r1 (Junos OS Evolved), 19.3-r2 (Junos OS Evolved), and 19.4-r1 (Junos OS Evolved).
How can I fix CVE-2020-1638?
To fix CVE-2020-1638, it is recommended to upgrade to a non-vulnerable version of Juniper Networks Junos OS or Junos OS Evolved.
Where can I find more information about CVE-2020-1638?
More information about CVE-2020-1638 can be found at the following reference: [https://kb.juniper.net/JSA11019](https://kb.juniper.net/JSA11019).
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- vendor/juniper
- canonical/juniper junos
- version/juniper junos/19.2
- version/juniper junos/19.2-r1
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- version/juniper junos/19.2-r1-s2
- version/juniper junos/19.2-r1-s3
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- version/juniper junos/19.3-r2
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- canonical/juniper mx240
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- canonical/juniper mx960
- canonical/juniper junos os evolved
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