CVE-2020-9321 Traefik has an Improper Certificate Handling issue

What is CVE-2020-9321?

CVE-2020-9321 is a high-severity vulnerability in Traefik Traefik, published on 16 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-295

Which versions are affected by CVE-2020-9321?

5 open source packages ship an affected version, including github.com/traefik/traefik, github.com/containous/traefik and github.com/containous/traefik/v2. It affects 2 products.

Products include Traefik Traefik, Traefik Traefik Enterprise.

How do I fix CVE-2020-9321?

Upgrade github.com/traefik/traefik to 2.1.4 or later.

Is CVE-2020-9321 being exploited?

There is no known exploitation of CVE-2020-9321 in the wild and no public exploit code.

Other vulnerabilities in Traefik Traefik

• CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik Critical 9.8
• CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect Critical 9.3
• CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth Critical 9.3
• CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse Critical 9.1
• CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging High 8.8

All Traefik Traefik vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-7h6j-2268-fhcm, GO-2022-0808.