Vulnerability Name:

CVE-2020-1638 (CCN-179306)

Assigned:2019-11-04
Published:2020-04-08
Updated:2022-01-01
Summary: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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-1638

Source: XF
Type: UNKNOWN
juniper-cve20201638-dos(179306)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11019
Junos OS & Junos OS Evolved: A specific IPv4 packet can lead to FPC restart. (CVE-2020-1638)

Source: CONFIRM
Type: Vendor Advisory
https://kb.juniper.net/JSA11019

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos:19.2:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.3:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r1:*:*:*:*:*:*
  • AND
  • cpe:/h:juniper:mx10003:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:mx2008:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:mx2010:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:mx2020:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:mx240:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:mx480:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:mx960:-:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:*
  • AND
  • cpe:/h:juniper:ptx10003:-:*:*:*:*:*:*:*
  • OR cpe:/h:juniper:qfx5220:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos:19.2:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    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 -
    juniper junos 19.2 -