01 Record
CVE-2021-0269
Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks.
HighPUBLISHEDCNA: juniper
CNA base score8.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
02 Description
Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks.
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
- 0.87% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 58.5% of scored records. A rank, not a probability.
- NVD base score
- 8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
- 2024-09-17 01:12Z2 YR AGO
- Reserved
- 2020-10-27
- Assigning CNA
- juniper
- Record state
- PUBLISHED
- Severity
- High (CVSS 8.8)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-233Improper Handling of ParametersBase
- Data version
- 5.1
- Document digest
- 45cd4325040d8180dd40e47e1b4d579f6e4ada8a55f3af8c61bc2b2216bc5a06
05 Affected products
VendorProductVersionsPlatforms
Juniper NetworksJunos OS< 17.4R3-S3, 18.1 to < 18.1R3-S12, 18.2 to < 18.2R3-S6, 18.3 to < 18.3R3-S4, 18.4 to < 18.4R3-S6, 19.1 to < 19.1R3-S4, 19.2 to < 19.2R3-S1, 19.3 to < 19.3R3-S1, 19.4 to < 19.4R2-S2, 19.4R3, 20.1 to < 20.1R2, 20.2 to < 20.2R2—
06 References
- kb.juniper.nethttps://kb.juniper.net/JSA11160
07 Remediation
The following software releases have been updated to resolve this specific issue: 17.4R3-S3, 18.1R3-S12, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S4, 19.2R3-S1, 19.3R3-S1, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases.