01 Record
CVE-2021-23018
Intra-cluster communication does not use TLS. The services within the NGINX Controller 3.x before 3.4.0 namespace are using cleartext protocols inside the cluster.
UnratedPUBLISHEDCNA: f5
CNA base scoreUnratedNo CNA CVSS vector
02 Description
Intra-cluster communication does not use TLS. The services within the NGINX Controller 3.x before 3.4.0 namespace are using cleartext protocols inside the cluster.
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
- 0.54% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 45.3% of scored records. A rank, not a probability.
- NVD base score
- 7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- 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
- 2021-06-01 11:51Z5 YR AGO
- Last updated
- 2024-08-03 18:58Z2 YR AGO
- Reserved
- 2021-01-06
- Assigning CNA
- f5
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-319Cleartext Transmission of Sensitive InformationBase
- Data version
- 5.1
- Document digest
- 6a293e210b992af885e60cd43f9c9fb8ceff4089b5471447bf042dd0f20b8c03
05 Affected products
VendorProductVersionsPlatforms
06 References
- support.f5.comhttps://support.f5.com/csp/article/K97002210