Vulnerability Details : CVE-2020-1638
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.
Vulnerability category: Denial of service
Products affected by CVE-2020-1638
- cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-1638
0.10%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 41 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-1638
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
Juniper Networks, Inc. |
CWE ids for CVE-2020-1638
-
The code calls sizeof() on a pointer type, which can be an incorrect calculation if the programmer intended to determine the size of the data that is being pointed to.Assigned by: sirt@juniper.net (Secondary)
References for CVE-2020-1638
-
https://kb.juniper.net/JSA11019
2020-04 Security Bulletin: Junos OS & Junos OS Evolved: A specific IPv4 packet can lead to FPC restart. (CVE-2020-1638) - Juniper NetworksVendor Advisory
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