CVE detail

CVE-2021-0242 — CVE-2021-0242

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
0.0040
EPSS probability
exploitation probability, 30d
33.0%
EPSS percentile
percentile vs all CVEs
NOT LISTED
CISA KEV
known exploited catalog

Description

A vulnerability due to the improper handling of direct memory access (DMA) buffers on EX4300 switches on Juniper Networks Junos OS allows an attacker sending specific unicast frames to trigger a Denial of Service (DoS) condition by exhausting DMA buffers, causing the FPC to crash and the device to restart. The DMA buffer leak is seen when receiving these specific, valid unicast frames on an interface without Layer 2 Protocol Tunneling (L2PT) or dot1x configured. Interfaces with either L2PT or dot1x configured are not vulnerable to this issue. When this issue occurs, DMA buffer usage keeps increasing and the following error log messages may be observed: Apr 14 14:29:34.360 /kernel: pid 64476 (pfex_junos), uid 0: exited on signal 11 (core dumped) Apr 14 14:29:33.790 init: pfe-manager (PID 64

Remediation

vendor remediation guidance

The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S7, 18.3R3-S4, 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S3, 19.4R3-S1, 20.1R2, 20.2R2-S1, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.

workarounds

There are no known workarounds for this issue.

ProductVulnerable rangeFixed versionAdvisory
Juniper Networks Junos OS>=17.3<17.3R3-S1117.3R3-S11advisory ↗
Juniper Networks Junos OS>=17.4<17.4R2-S13, 17.4R3-S417.4R2-S13, 17.4R3-S4advisory ↗
Juniper Networks Junos OS>=18.1<18.1R3-S1218.1R3-S12advisory ↗
Juniper Networks Junos OS>=18.2<18.2R2-S8, 18.2R3-S718.2R2-S8, 18.2R3-S7advisory ↗
Juniper Networks Junos OS>=18.3<18.3R3-S418.3R3-S4advisory ↗
Juniper Networks Junos OS>=18.4<18.4R1-S8, 18.4R2-S7, 18.4R3-S718.4R1-S8, 18.4R2-S7, 18.4R3-S7advisory ↗
Juniper Networks Junos OS>=19.1<19.1R1-S6, 19.1R2-S2, 19.1R3-S419.1R1-S6, 19.1R2-S2, 19.1R3-S4advisory ↗
Juniper Networks Junos OS>=19.2<19.2R1-S6, 19.2R3-S219.2R1-S6, 19.2R3-S2advisory ↗
Juniper Networks Junos OS>=19.3<19.3R3-S219.3R3-S2advisory ↗
Juniper Networks Junos OS>=19.4<19.4R2-S3, 19.4R3-S119.4R2-S3, 19.4R3-S1advisory ↗
Juniper Networks Junos OS>=20.1<20.1R220.1R2advisory ↗
Juniper Networks Junos OS>=20.2<20.2R2-S1, 20.2R320.2R2-S1, 20.2R3advisory ↗
Juniper Networks Junos OS>=20.3<20.3R1-S1, 20.3R220.3R1-S1, 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.