01 Record

CVE-2021-31351

Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset

HighPUBLISHEDCNA: juniper

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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02 Description

Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset

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: 1.02% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 63.0% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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

2021-10-19 18:16Z5 YR AGO

Last updated

2024-09-17 01:26Z2 YR AGO

Reserved

2021-04-15

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

CWE-754Improper Check for Unusual or Exceptional ConditionsClass

Data version

5.1

Document digest

0750aa31de810a4b063ab1d5f294d7439b40e5cd4782a7d6fca14e4803cce2ad

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS17.3R3-S11, 18.1R3-S12, 18.3R3-S4, 18.4R3-S7, 19.1R3-S4, 19.1R3-S5, 19.2R1-S6, 19.3R3-S2, 19.4R3-S2, 20.1R2-S1, 20.2R3, 20.3R2, 17.4R2-S13 to < 17.4*, 18.2R2-S8, 18.2R3-S7 to < 18.2*, 18.4R1-S8, 18.4R2-S7 to < 18.4*, 19.4R2-S4 to < 19.4*, 20.2R2-S2 to < 20.2*, 20.3R1-S2 to < 20.3*, 20.4 to < 20.4R2-S1, 20.4R3, 21.1 to < 21.1R1-S1, 21.1R2MX Series

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11216x_refsource_CONFIRM

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R3-S8, 19.1R3-S6, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S3, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases. Note: Only those releases listed in the PROBLEM section above are affected. This fix has also been proactively committed into other releases that are not vulnerable to this issue.