CVE-2021-23018 json
Intra-cluster communication does not use TLS.
published 2021-06-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10136
- cvss
- 7.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
Affected products
- n/a Nginx Controller
Classification
- Weakness
-
- CWE-319 Cleartext Transmission of Sensitive Information
References
-
support.f5.com
/csp/article/K97002210
vendor-advisory
Sources
- CVE List CVE-2021-23018
- NVD CVE-2021-23018
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