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01 Record

CVE-2021-0236

Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.

MediumPUBLISHEDCNA: juniper
CNA base score6.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

02 Description

Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.

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
0.84% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 57.6% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/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
2021-04-22 19:37Z5 YR AGO
Last updated
2024-09-16 19:15Z2 YR AGO
Reserved
2020-10-27
Assigning CNA
juniper
Record state
PUBLISHED
Severity
Medium (CVSS 6.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/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
bfc54d5e7c8490a4108ec5dc1322f476d96ca37bc5f7f62659a1a0ad235e7e21

05 Affected products

VendorProductVersionsPlatforms
Juniper NetworksJunos OS18.4 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-S2, 19.4 to < 19.4R2-S4, 19.4R3-S1, 20.1 to < 20.1R2, 20.1R3, 20.1R3-EVO, 20.2 to < 20.2R2, 20.2R3, 20.2R3-EVO, 20.3 to < 20.3R1-S1, 20.3R2, 20.3R2-EVO—
Juniper NetworksJunos OS Evolved20.3-EVO to < 20.3R2-EVO—

06 References

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS: 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1 and all subsequent releases. Junos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.