CVE-2021-23018

7.4 highEPSS 0.5%

High (7.4) in f5 nginx controller. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.4 high

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
CWE: CWE-319
Published: 2021-06-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

f5:nginx_controller

References

https://support.f5.com/csp/article/K97002210
https://support.f5.com/csp/article/K97002210

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