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.
https://github.com/advisories/GHSA-7h6j-2268-fhcm
https://github.com/containous/traefik/releases/tag/v2.1.4