security Updates for cable modems

I read an article on NPR on 4/24/2018 discussing cyber threats***. The article said that vendors of cable modems are putting out guidance for applying patches for cable modems.How do I get the security updates for my Cox cable modem (UBEE DUBW66P, a.k.a DDW366)

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(www.npr.org/.../sounding-the-alarm-about-a-new-russian-cyber-threat)