CVE detail

CVE-2020-1656 — CVE-2020-1656

Published 2020-10-16 · Modified 2026-06-17 · Vendor juniper · Product junos · Source nvd
HIGH
severity
CVSS-derived band
8.8
CVSS v3
0–10 scale
0.0111
EPSS probability
exploitation probability, 30d
63.0%
EPSS percentile
percentile vs all CVEs
NOT LISTED
CISA KEV
known exploited catalog

Description

The DHCPv6 Relay-Agent service, part of the Juniper Enhanced jdhcpd daemon shipped with Juniper Networks Junos OS has an Improper Input Validation vulnerability which will result in a Denial of Service (DoS) condition when a DHCPv6 client sends a specific DHPCv6 message allowing an attacker to potentially perform a Remote Code Execution (RCE) attack on the target device. Continuous receipt of the specific DHCPv6 client message will result in an extended Denial of Service (DoS) condition. If adjacent devices are also configured to relay DHCP packets, and are not affected by this issue and simply transparently forward unprocessed client DHCPv6 messages, then the attack vector can be a Network-based attack, instead of an Adjacent-device attack. No other DHCP services are affected. Receipt of

Remediation

vendor remediation guidance

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.

workarounds

There are no available workarounds for this issue.

ProductVulnerable rangeFixed versionAdvisory
Juniper Networks Junos OS>=12.3<12.3R12-S1512.3R12-S15advisory ↗
Juniper Networks Junos OS>=12.3X48<12.3X48-D9512.3X48-D95advisory ↗
Juniper Networks Junos OS>=14.1X53<14.1X53-D5314.1X53-D53advisory ↗
Juniper Networks Junos OS>=15.1<15.1R7-S615.1R7-S6advisory ↗
Juniper Networks Junos OS>=15.1X49<15.1X49-D20015.1X49-D200advisory ↗
Juniper Networks Junos OS>=15.1X53<15.1X53-D59315.1X53-D593advisory ↗
Juniper Networks Junos OS>=16.1<16.1R7-S716.1R7-S7advisory ↗
Juniper Networks Junos OS>=16.2<16.2R2-S1116.2R2-S11advisory ↗
Juniper Networks Junos OS>=17.1<17.1R2-S11, 17.1R3-S217.1R2-S11, 17.1R3-S2advisory ↗
Juniper Networks Junos OS>=17.2<17.2R3-S317.2R3-S3advisory ↗
Juniper Networks Junos OS>=17.2X75<17.2X75-D4417.2X75-D44advisory ↗
Juniper Networks Junos OS>=17.3<17.3R3-S717.3R3-S7advisory ↗
Juniper Networks Junos OS>=17.4<17.4R2-S9, 17.4R317.4R2-S9, 17.4R3advisory ↗
Juniper Networks Junos OS>=18.1<18.1R3-S918.1R3-S9advisory ↗
Juniper Networks Junos OS>=18.2<18.2R2-S6, 18.2R3-S218.2R2-S6, 18.2R3-S2advisory ↗
Juniper Networks Junos OS>=18.2X75<18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D6018.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60advisory ↗
Juniper Networks Junos OS>=18.3<18.3R1-S7, 18.3R2-S3, 18.3R3-S118.3R1-S7, 18.3R2-S3, 18.3R3-S1advisory ↗
Juniper Networks Junos OS>=18.4<18.4R1-S5, 18.4R2-S3, 18.4R318.4R1-S5, 18.4R2-S3, 18.4R3advisory ↗
Juniper Networks Junos OS>=19.1<19.1R1-S4, 19.1R219.1R1-S4, 19.1R2advisory ↗
Juniper Networks Junos OS>=19.2<19.2R1-S3, 19.2R219.2R1-S3, 19.2R2advisory ↗
Juniper Networks Junos OS>=19.3<19.3R219.3R2advisory ↗

References

cvedb.io · NVD · CISA KEV · FIRST EPSS · vendor advisories (CVE Program List v5). Informational only, no warranty — verify every remediation against the vendor advisory before acting on it. This product uses data from the NVD API but is not endorsed or certified by the NVD, CISA, FIRST.org or any vendor named. CVE® is a registered trademark of The MITRE Corporation.