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TI-2020-01628 Aliases CVE-2020-1681GHSA-w8cp-6x5g-mf2j

Junos OS Evolved: Receipt of a specifically malformed NDP packet could lead to Denial of Service

Priority LOW 29CWE-755Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-617.

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.

Why it matters now

EPSS 0.00509 43rd percentileScored 2026-11-07
Fix Fixed Junos OS Evolved (Juniper Networks): 20.1R2-EVO

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
JuniperJunos OS Evolvedall to before 20.1R2-EVO20.1R2-EVOPatch availableCNA
  • Junos OS Evolved VendorJuniper Affected all to before 20.1R2-EVO Fixed in 20.1R2-EVO Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:*19.2 r1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:19.2:r2:*:*:*:*:*:*19.2 r2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*19.3 r2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:*19.4 r1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:19.4:r2:*:*:*:*:*:*19.4 r2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:19.4:r2-s1:*:*:*:*:*:*19.4 r2-s1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:*20.1 r1VulnerableJuniper
  • cpe:2.3:o:juniper:junos_os_evolved:19.2:r1:*:*:*:*:*:* Versions 19.2 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:19.2:r2:*:*:*:*:*:* Versions 19.2 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:* Versions 19.3 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:19.4:r1:*:*:*:*:*:* Versions 19.4 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:19.4:r2:*:*:*:*:*:* Versions 19.4 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:19.4:r2-s1:*:*:*:*:*:* Versions 19.4 r2-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:* Versions 20.1 r1 Vulnerable ·Juniper

Remediation

  • Fix · CNA Junos OS Evolved (Juniper Networks) Fixed in 20.1R2-EVO

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Juniper Networks Junos OS Evolved 20.1R2-EVO

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2020-01611 Junos OS and Junos OS Evolved: RPD crash due to BGP session flapping.Priority LOW 35
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1681
  2. 2026-10-03 Alias added: GHSA-w8cp-6x5g-mf2j

References

Advisory 1

  • TI-2026-17602 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root CVSS 4.0CRITICAL 9.3
  • TI-2026-17601 Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash CVSS 4.0MEDIUM 6.7
  • TI-2023-04136 Improper input validation in Juniper Junos OS CVSS 3.1HIGH 7.5
  • TI-2026-74215 Stack-based buffer overflow in Junos OS rpd triggered by BGP peers CVSS 4.0CRITICAL 9.3
  • TI-2026-74211 Authentication bypass in Juniper J-Web allows pre-auth CGI execution CVSS 4.0CRITICAL 9.3
  • TI-2021-00146 Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted. CVSS 3.1CRITICAL 10.0
See all 249 →

Sources

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