Check if your browser shows a lock symbol on any important sites you visit.
(This affects the PKI as a whole, because a single unconstrained compromised sub-CA can misissue for any domain - so if you use HTTPS, you're affected).
If your question is whether you should take action, the answer is no, unless you're in some way responsible for an intermediate CA, which is something you'd know about.
(This affects the PKI as a whole, because a single unconstrained compromised sub-CA can misissue for any domain - so if you use HTTPS, you're affected).
If your question is whether you should take action, the answer is no, unless you're in some way responsible for an intermediate CA, which is something you'd know about.