What is CVE-2020-9321?

CVE-2020-9321 is a high-severity vulnerability in Traefik, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2020-03-16.

How severe is CVE-2020-9321?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Traefik

CVE-2020-9321

configurationwatcher.go in Traefik 2.x before 2.1.4 and TraefikEE 2.0.0 mishandles the purging of certificate contents from providers before logging.

Vulnerability class: Improper Certificate Validation

Published 2020-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Traefik
Traefik Enterprise — versions 2.0.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

github.com/containous/traefik/pull/6281 (Patch, Third Party Advisory)
github.com/containous/traefik/releases/tag/v2.1.4 (Release Notes)

Frequently asked questions

What is CVE-2020-9321?: CVE-2020-9321 is a high-severity vulnerability in Traefik, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2020-03-16.
How severe is CVE-2020-9321?: High severity. CVSS v3 base score is 7.5 out of 10.