01 Record

CVE-2021-0259

Junos OS and Junos OS Evolved: QFX5K Series: Underlay network traffic might not be processed upon receipt of high rate of specific genuine overlay packets in VXLAN scenario

HighPUBLISHEDCNA: juniper

CNA base score7.4 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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02 Description

Junos OS and Junos OS Evolved: QFX5K Series: Underlay network traffic might not be processed upon receipt of high rate of specific genuine overlay packets in VXLAN scenario

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.38% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 31.9% of scored records. A rank, not a probability.
NVD base score: 7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-04-22 19:37Z5 YR AGO

Last updated

2024-09-16 17:48Z2 YR AGO

Reserved

2020-10-27

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 7.4)

CNA CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weaknesses

CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.1

Document digest

5ac0540159370ef6069f780a5c79fcd02a6654c61d60c24365ea47640904b0f4

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS17.3 to < 17.3R3-S11, 17.4 to < 17.4R3-S5, 18.1 to < 18.1R3-S13, 18.2 to < 18.2R2-S8, 18.2R3-S8, 18.3 to < 18.3R3-S5, 18.4 to < 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1 to < 19.1R3-S4, 19.2 to < 19.2R1-S6, 19.2R3-S2, 19.3 to < 19.3R3-S2, 19.4 to < 19.4R2-S4, 19.4R3-S1, 20.1 to < 20.1R2, 20.2 to < 20.2R2, 20.3 to < 20.3R1-S2, 20.3R2QFX5K Series

Juniper NetworksJunos OS Evolved< 20.3R2-EVOQFX5220

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11150x_refsource_MISC

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS: 17.3R3-S11, 17.4R3-S5, 18.1R3-S13, 18.2R2-S8, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases. Junos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.