CVE detail

CVE-2021-0237 — CVE-2021-0237

Published 2021-04-22 · Modified 2026-06-17 · Vendor juniper · Product junos · Source nvd
MEDIUM
severity
CVSS-derived band
6.5
CVSS v3
0–10 scale
0.0038
EPSS probability
exploitation probability, 30d
31.0%
EPSS percentile
percentile vs all CVEs
NOT LISTED
CISA KEV
known exploited catalog

Description

On Juniper Networks EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series deployed as a Virtual Chassis with a specific Layer 2 circuit configuration, Packet Forwarding Engine manager (FXPC) process may crash and restart upon receipt of specific layer 2 frames. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4, 17.4R3-S5; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-

Remediation

vendor remediation guidance

The following software releases have been updated to resolve this specific issue: 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 17.4R3-S5, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R3-S1, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases.

workarounds

There are no viable workarounds for this issue.

ProductVulnerable rangeFixed versionAdvisory
Juniper Networks Junos OS>=15.1<15.1R7-S915.1R7-S9advisory ↗
Juniper Networks Junos OS>=17.3<17.3R3-S1117.3R3-S11advisory ↗
Juniper Networks Junos OS>=17.4<17.4R2-S13, 17.4R3-S4, 17.4R3-S517.4R2-S13, 17.4R3-S4, 17.4R3-S5advisory ↗
Juniper Networks Junos OS>=18.2<18.2R3-S818.2R3-S8advisory ↗
Juniper Networks Junos OS>=18.3<18.3R3-S418.3R3-S4advisory ↗
Juniper Networks Junos OS>=18.4<18.4R2-S7, 18.4R3-S618.4R2-S7, 18.4R3-S6advisory ↗
Juniper Networks Junos OS>=19.1<19.1R3-S419.1R3-S4advisory ↗
Juniper Networks Junos OS>=19.2<19.2R1-S6, 19.2R3-S119.2R1-S6, 19.2R3-S1advisory ↗
Juniper Networks Junos OS>=19.3<19.3R3-S119.3R3-S1advisory ↗
Juniper Networks Junos OS>=19.4<19.4R2-S4, 19.4R3-S119.4R2-S4, 19.4R3-S1advisory ↗
Juniper Networks Junos OS>=20.1<20.1R220.1R2advisory ↗
Juniper Networks Junos OS>=20.2<20.2R2, 20.2R320.2R2, 20.2R3advisory ↗
Juniper Networks Junos OS>=20.3<20.3R1-S2, 20.3R220.3R1-S2, 20.3R2advisory ↗

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.