According to Yubico, the RSA vulnerability only affects the YubiKey 4 and "all YubiKey 4 products shipped by Yubico after June 6, 2017 (version 4.3.5 or higher

According to Yubico, the RSA vulnerability only affects the YubiKey 4 and "all YubiKey 4 products shipped by Yubico after June 6, 2017 (version 4.3.5 or higher) use" a new implementation that is secure from this. https://www.yubico.com/support/security-advisories/ysa-2017-01/ https://www.yubico.com/support/security-advisories/ysa-2017-...