01 Record

CVE-2020-1656

Junos OS: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client message, Remote Code Execution may occur.

HighPUBLISHEDCNA: juniper

CNA base score8.8 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

Junos OS: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client message, Remote Code Execution may occur.

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.10% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 65.6% of scored records. A rank, not a probability.
NVD base score: 8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2020-10-16 20:31Z6 YR AGO

Last updated

2024-09-17 04:14Z2 YR AGO

Reserved

2019-11-04

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-20Improper Input ValidationClass
CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

6b88194b35407a88735b7fc7dcbd86a7b3385cc79896cb192ce529ca3d87c1ae

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS12.3 to < 12.3R12-S15, 12.3X48 to < 12.3X48-D95, 14.1X53 to < 14.1X53-D53, 15.1 to < 15.1R7-S6, 15.1X49 to < 15.1X49-D200, 15.1X53 to < 15.1X53-D593, 16.1 to < 16.1R7-S7, 16.2 to < 16.2R2-S11, 17.1 to < 17.1R2-S11, 17.1R3-S2, 17.2 to < 17.2R3-S3, 17.2X75 to < 17.2X75-D44, 17.3 to < 17.3R3-S7, 17.4 to < 17.4R2-S9, 17.4R3, 18.1 to < 18.1R3-S9, 18.2 to < 18.2R2-S6, 18.2R3-S2, 18.2X75 to < 18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60, 18.3 to < 18.3R1-S7, 18.3R2-S3, 18.3R3-S1, 18.4 to < 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1 to < 19.1R1-S4, 19.1R2, 19.2 to < 19.2R1-S3, 19.2R2, 19.3 to < 19.3R2—

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11049x_refsource_CONFIRM
www.juniper.nethttps://www.juniper.net/documentation/en_US/junos/topics/topic-map/dhcpv6-relay-agent-overview.htmlx_refsource_MISC
www.juniper.nethttps://www.juniper.net/documentation/en_US/junos/topics/topic-map/dhcp-relay-agent-security-devices.htmlx_refsource_MISC
www.juniper.nethttps://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/show-dhcpv6-relay-statistics.htmlx_refsource_MISC

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S15, 12.3X48-D100, 12.3X48-D95, 14.1X53-D53, 15.1R7-S6, 15.1X49-D200, 15.1X53-D593, 16.1R7-S7, 16.2R2-S11, 17.1R2-S11, 17.1R3-S2, 17.2R3-S3, 17.2X75-D44, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S9, 18.2R2-S6, 18.2R3-S2, 18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60, 18.3R1-S7, 18.3R2-S3, 18.3R3-S1, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2, 19.1R3, 19.2R1-S3, 19.2R2, 19.4R1, and all subsequent releases.