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vnprc | 2 months ago (raw) | root | parent | reply | flag +4 
 Casa recently added yubikey support. 

https://blog.casa.io/secure-your-bitcoin-with-yubikey/

Casa supports firmware versions >= 5.5. This vulnerability exists for firmware versions < 5.7. Install Yubikey Manager to check your firmware version.

https://www.yubico.com/support/download/yubikey-manager/
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Jameson Lopp | 2 months ago (raw) | root | parent | reply | flag +1 
 We only started shipping Yubikeys with version 5.7 so it's probably low likelihood someone brought their own 5.5 device.
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de279ef2 | 2 months ago (raw) | root | parent | reply | flag +1 
 Oh didn’t realize that was Casa. You guys rock so know you’re on top of it.
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Jameson Lopp | 2 months ago (raw) | root | parent | reply | flag 
 Upon closer review it appears that the only Yubikeys with firmware version 5.5 were the Yubikey Bio, so I bet the total number of those in the wild are rather low.
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de279ef2 | 2 months ago (raw) | root | parent | reply | flag 
 Do you mean Yubikeys that Casa distributed? 

I just checked my 5Ci and it’s fw 5.4.3.