01 Record

CVE-2021-0254

Junos OS: Remote code execution vulnerability in overlayd service

CriticalPUBLISHEDCNA: juniper

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

Junos OS: Remote code execution vulnerability in overlayd service

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: 2.56% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 84.8% of scored records. A rank, not a probability.
NVD base score: 9.8 (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:H/I:H/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 20:11Z2 YR AGO

Reserved

2020-10-27

Assigning CNA

juniper

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

CWE-131Incorrect Calculation of Buffer SizeBase
CWE-787Out-of-bounds WriteBase

Data version

5.1

Document digest

7bd7432be141372d84753e5463d2c94e900c1ca3170c31edf913a3b2aa8fd64a

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS15.1 to < 15.1R7-S9, 17.3 to < 17.3R3-S11, 17.4 to < 17.4R2-S13, 17.4R3-S4, 18.1 to < 18.1R3-S12, 18.2 to < 18.2R2-S8, 18.2R3-S7, 18.3 to < 18.3R3-S4, 18.4 to < 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1 to < 19.1R2-S2, 19.1R3-S4, 19.2 to < 19.2R1-S6, 19.2R3-S2, 19.3 to < 19.3R3-S1, 19.4 to < 19.4R2-S4, 19.4R3-S1, 20.1 to < 20.1R2-S1, 20.1R3, 20.2 to < 20.2R2, 20.2R2-S1, 20.2R3, 20.3 to < 20.3R1-S1—

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11147x_refsource_MISC

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS 15.1X49-D240, 15.1R7-S9, 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, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S1, 19.4R2-S4, 19.4R3-S1, 20.1R2-S1, 20.1R3, 20.2R2, 20.2R2-S1, 20.2R3, 20.3R1-S1, 20.4R1, and all subsequent releases. This fix has also been proactively committed into other releases that might not be vulnerable to this issue.