01 Record

CVE-2021-0251

Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services service activation portal is vulnerable to a Denial of Service (DoS) via malformed HTTP packets

HighPUBLISHEDCNA: juniper

CNA base score8.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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02 Description

Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services service activation portal is vulnerable to a Denial of Service (DoS) via malformed HTTP packets

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: 1.06% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 64.5% of scored records. A rank, not a probability.
NVD base score: 8.6 (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: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 18:56Z2 YR AGO

Reserved

2020-10-27

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

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

Weaknesses

CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

9d10d6d2d96c8369e77ec884fbd81c7989b5b2b42dd066c8e6bc7ca880a89a65

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS17.3R1 to < 17.3*, 17.4 to < 17.4R2-S9, 17.4R3-S2, 18.1 to < 18.1R3-S9, 18.2 to < 18.2R3-S3, 18.3 to < 18.3R3-S1, 18.4 to < 18.4R3, 19.1 to < 19.1R2-S2, 19.1R3, 19.2 to < 19.2R2, 19.3 to < 19.3R3MX Series

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11144x_refsource_MISC

07 Remediation

The following software releases have been updated to resolve this specific issue: 17.4R2-S9, 17.4R3-S2, 18.1R3-S9, 18.2R3-S3, 18.3R3-S1, 18.4R3, 19.1R2-S2, 19.1R3, 19.2R2, 19.3R3, 19.4R1, and all subsequent releases.