Vulnerability Name:

CVE-2021-0287 (CCN-205433)

Assigned:2020-10-27
Published:2021-07-14
Updated:2021-10-25
Summary:In a Segment Routing ISIS (SR-ISIS)/MPLS environment, on Juniper Networks Junos OS and Junos OS Evolved devices, configured with ISIS Flexible Algorithm for Segment Routing and sensor-based statistics, a flap of a ISIS link in the network, can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued link flaps will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 19.4 versions prior to 19.4R1-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S2, 20.2R3; 20.3 versions prior to 20.3R2; Juniper Networks Junos OS Evolved: 20.3-EVO versions prior to 20.3R2-EVO; 20.4-EVO versions prior to 20.4R2-EVO. This issue does not affect: Juniper Networks Junos OS releases prior to 19.4R1. Juniper Networks Junos OS Evolved releases prior to 19.4R1-EVO.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/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): Adjacent
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
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/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): Adjacent
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:5.7 Medium (CVSS v2 Vector: AV:A/AC:M/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
6.1 Medium (CCN CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-754
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-0287

Source: XF
Type: UNKNOWN
juniper-cve20210287-dos(205433)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11189
Junos OS and Junos OS Evolved: RPD could crash in SR-ISIS/MPLS environment due to a flap of a ISIS link in the network (CVE-2021-0287)

Source: CONFIRM
Type: Vendor Advisory
https://kb.juniper.net/JSA11189

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos:19.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r1-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r1-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r2-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r2-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:19.4:r3-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r1-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r1-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r1-s4:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r1-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r1-s3:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.3:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.3:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos:19.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.1:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_evolved:19.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_evolved:20.1:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:20.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_evolved:20.3:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_evolved:20.2:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    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 r2
    juniper junos 19.4 r2-s1
    juniper junos 19.4 r2-s2
    juniper junos 19.4 r2-s3
    juniper junos 19.4 r3
    juniper junos 19.4 r3-s1
    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 20.1 r2
    juniper junos 20.2 r1
    juniper junos 20.2 r1-s1
    juniper junos 20.2 r1-s2
    juniper junos 20.2 r1-s3
    juniper junos 20.2 r2
    juniper junos 20.2 r2-s1
    juniper junos 20.3 r1
    juniper junos 20.3 r1-s1
    juniper junos os evolved 20.3 -
    juniper junos os evolved 20.3 r1
    juniper junos os evolved 20.4 r1-s1
    juniper junos 19.4 r1
    juniper junos 20.1 r1
    juniper junos 20.2 r1
    juniper junos evolved 19.4 r1
    juniper junos evolved 20.1 -
    juniper junos 20.3 r1
    juniper junos evolved 20.3 -
    juniper junos evolved 20.2 -