CVE detail

CVE-2020-1687 — CVE-2020-1687

Published 2020-10-16 · Modified 2026-06-17 · Vendor juniper · Product junos · Source nvd
MEDIUM
severity
CVSS-derived band
6.5
CVSS v3
0–10 scale
0.0050
EPSS probability
exploitation probability, 30d
40.0%
EPSS percentile
percentile vs all CVEs
NOT LISTED
CISA KEV
known exploited catalog

Description

On Juniper Networks EX4300-MP Series, EX4600 Series and QFX5K Series deployed in (Ethernet VPN) EVPN-(Virtual Extensible LAN) VXLAN configuration, receipt of a stream of specific VXLAN encapsulated layer 2 frames can cause high CPU load, which could lead to network protocol operation issue and traffic interruption. This issue affects devices that are configured as a Layer 2 or Layer 3 gateway of an EVPN-VXLAN deployment. The offending layer 2 frames that cause the issue originate from a different access switch that get encapsulated within the same EVPN-VXLAN domain. This issue affects Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series and QFX5K Series: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.

Remediation

vendor remediation guidance

The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S9, 17.4R2-S11, 17.4R3-S2, 17.4R3-S3, 18.1R3-S11, 18.2R3-S5, 18.3R2-S4, 18.3R3-S3, 18.4R2-S5, 18.4R3-S4, 19.1R2-S2, 19.1R3-S2, 19.2R1-S5, 19.2R2-S1, 19.2R3, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2-S1, 19.4R3, 20.1R1-S3, 20.1R2, 20.2R1 and all subsequent releases.

workarounds

There are no viable workarounds for this issue.

ProductVulnerable rangeFixed versionAdvisory
Juniper Networks Junos OS>=17.3<17.3R3-S917.3R3-S9advisory ↗
Juniper Networks Junos OS>=17.4<17.4R2-S11, 17.4R3-S2, 17.4R3-S317.4R2-S11, 17.4R3-S2, 17.4R3-S3advisory ↗
Juniper Networks Junos OS>=18.1<18.1R3-S1118.1R3-S11advisory ↗
Juniper Networks Junos OS>=18.2<18.2R3-S518.2R3-S5advisory ↗
Juniper Networks Junos OS>=18.3<18.3R2-S4, 18.3R3-S318.3R2-S4, 18.3R3-S3advisory ↗
Juniper Networks Junos OS>=18.4<18.4R2-S5, 18.4R3-S418.4R2-S5, 18.4R3-S4advisory ↗
Juniper Networks Junos OS>=19.1<19.1R2-S2, 19.1R3-S219.1R2-S2, 19.1R3-S2advisory ↗
Juniper Networks Junos OS>=19.2<19.2R1-S5, 19.2R2-S1, 19.2R319.2R1-S5, 19.2R2-S1, 19.2R3advisory ↗
Juniper Networks Junos OS>=19.3<19.3R2-S4, 19.3R319.3R2-S4, 19.3R3advisory ↗
Juniper Networks Junos OS>=19.4<19.4R1-S3, 19.4R2-S1, 19.4R319.4R1-S3, 19.4R2-S1, 19.4R3advisory ↗
Juniper Networks Junos OS>=20.1<20.1R1-S3, 20.1R220.1R1-S3, 20.1R2advisory ↗

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.