01 Record
CVE-2021-0243
Junos OS: EX4300: Stateless firewall policer fails to discard traffic
MediumPUBLISHEDCNA: juniper
CNA base score4.7 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
02 Description
Junos OS: EX4300: Stateless firewall policer fails to discard traffic
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
- 0.37% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 31.3% of scored records. A rank, not a probability.
- NVD base score
- 4.7 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- 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 00:51Z2 YR AGO
- Reserved
- 2020-10-27
- Assigning CNA
- juniper
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 4.7)
- CNA CVSS vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- Weaknesses
- CWE-241Improper Handling of Unexpected Data TypeBase
- Data version
- 5.1
- Document digest
- 6f74b4f0f00ca5b7a8c451fb60340de1d9c7d6b2ef4a0a82deeed4bffbbcd633
05 Affected products
VendorProductVersionsPlatforms
Juniper NetworksJunos OS< 17.3R3-S10, 17.4 to < 17.4R3-S3, 18.1 to < 18.1R3-S11, 18.2 to < 18.2R3-S6, 18.3 to < 18.3R3-S4, 18.4 to < 18.4R3-S6, 19.1 to < 19.1R3-S3, 19.2 to < 19.2R3-S1, 19.3 to < 19.3R3-S1, 19.4 to < 19.4R3, 20.1 to < 20.1R2, 20.2 to < 20.2R2EX4300
06 References
- kb.juniper.nethttps://kb.juniper.net/JSA11136
07 Remediation
The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S10, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S3, 19.2R3-S1, 19.3R3-S1, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases.