Vulnerability Name:

CVE-2020-1681 (CCN-189908)

Assigned:2019-11-04
Published:2020-10-14
Updated:2022-10-21
Summary:Receipt of a specifically malformed NDP packet sent from the local area network (LAN) to a device running Juniper Networks Junos OS Evolved can cause the ndp process to crash, resulting in a Denial of Service (DoS). The process automatically restarts without intervention, but a continuous receipt of the malformed NDP packets could leaded to an extended Denial of Service condition. During this time, IPv6 neighbor learning will be affected. The issue occurs when parsing the incoming malformed NDP packet. Rather than simply discarding the packet, the process asserts, performing a controlled exit and restart, thereby avoiding any chance of an unhandled exception. Exploitation of this vulnerability is limited to a temporary denial of service, and cannot be leveraged to cause additional impact on the system. This issue is limited to the processing of IPv6 NDP packets. IPv4 packet processing cannot trigger, and is unaffected by this vulnerability. This issue affects all Juniper Networks Junos OS Evolved versions prior to 20.1R2-EVO. Junos OS is unaffected by this vulnerability.
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:3.3 Low (CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
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-617
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-1681

Source: XF
Type: UNKNOWN
juniper-cve20201681-dos(189908)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11078
Junos OS Evolved: Receipt of a specifically malformed NDP packet could lead to Denial of Service (CVE-2020-1681)

Source: CONFIRM
Type: Vendor Advisory
https://kb.juniper.net/JSA11078

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.2:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.4:r2:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos_evolved:19.2:r1:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    juniper junos os evolved 19.3 r2
    juniper junos os evolved 19.2 r1
    juniper junos os evolved 19.2 r2
    juniper junos os evolved 20.1 r1
    juniper junos os evolved 19.4 r1
    juniper junos os evolved 19.4 r2-s1
    juniper junos os evolved 19.4 r2
    juniper junos evolved 19.2 r1