Do I need any valid certification for CCIE security written exam?
I have good work experience and while studying it looks easy to me.
I have been through the certifications section and it doesn't say any prerequisites as such. But I am confused; all my previous certs are expired. So what is it exactly I need a valid certification or no?
No, any CCIE Written Exams doesn't have prerequisite. Yes, the written is easy.
You do not need any valid certification to do the CCIE. Just pass the written and the lab.
How much experience do you have? I went from CCNA to CCNP to CCIE R/S in less than a year, and I still would not characterize it as easy.