Junos OS: EX4300-MP/EX4600/EX4650/QFX5K Series: Packet Forwarding Engine manager (FXPC) process crashes when deployed in a Virtual Chassis (VC) configuration (Juniper Networks Junos OS)

CVE-2021-0237

MEDIUM 6.5

At a glance

Source: NVD
EPSS: EPSS 0.38 % · percentile 32 (2026-11-01)
State: PUBLISHED
Published: 2021-04-22 19:37 UTC
Updated: 2024-09-17 02:56 UTC
Assigner: juniper
NVD status: Modified

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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-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2;

References

https://kb.juniper.net/JSA11132

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	juniper
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · sirt@juniper.net (Secondary)
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	LOW 3.3	AV:A/AC:L/Au:N/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2021-2856
GCVE · GCVE-0-2021-0237

CERT-FR advisories

CERTFR-2021-AVI-290 — Multiples vulnérabilités dans les produits Juniper · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:juniper:junos:15.1:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:a1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f2-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f2-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f5-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s10:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s12:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s8:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f6-s9:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:f7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r4-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r4-s8:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r4-s9:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r5-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r5-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r5-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r5-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:15.1:r6:*:*:*:*:*:*
+176 more

Affected products

Product	Versions
Juniper Networks · Junos OS	affected 15.1 < 15.1R7-S9 ; affected 17.3 < 17.3R3-S11 ; affected 17.4 < 17.4R2-S13, 17.4R3-S4, 17.4R3-S5 ; affected 18.2 < 18.2R3-S8 ; affected 18.3 < 18.3R3-S4 ; affected 18.4 < 18.4R2-S7, 18.4R3-S6

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

🟡 Junos OS: EX4300-MP/EX4600/EX4650/QFX5K Series: Packet Forwarding Engine manager (FXPC) process crashes when deployed in a Virtual Chassis (VC) configuration (Juniper Networks Junos OS)