21 word seed got exposed, is it bad ?

[imjustagirl]

No, it would not. 3 missing seed words are recoverable, however the attacker would need to at least know some of your wallet addresses in order for it to work 100 %.  The more information an attacker has, the more chances he has to be able to break it. If you are not sure on the best way to back up this information, just input an extra word into your seed (just remember which one it is). Scrambling to find which word is fake and which ones are real, now that's a challenge I hardly think anyone could solve.

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[bob123]

No, it would not. 3 missing seed words are recoverable, however the attacker would need to at least know some of your wallet addresses in order for it to work 100 %. 

Actually an attacker woulnd not need to know an address from this wallet.
An attacker could easily just derive the priv-/pub- keypairs from each valid seed (using the most common derivation paths), and then check (e.g. via API) for unspent outputs.
Knowing an address of the wallet does increase the speed of this attack. But its definetely not necessary to perform such an 'attack'.

[posi]

With my understand is good to expose your wallet seed because recovery seeds is like your best friend and it the only thing you need to maintain the safety or recover of your coins.

[jackg]

With my understand is good to expose your wallet seed because recovery seeds is like your best friend and it the only thing you need to maintain the safety or recover of your coins.

What? Exposing your wallet seed is the worst thing you could do with a wallet that you are using as the person it is exposed to will have access to everything in your wallet.

Unless you mean exposing the seed in order to be able to write it down somewhere and not publicly exposing it OP is referring to).

[posi]

With my understand is good to expose your wallet seed because recovery seeds is like your best friend and it the only thing you need to maintain the safety or recover of your coins.

What? Exposing your wallet seed is the worst thing you could do with a wallet that you are using as the person it is exposed to will have access to everything in your wallet.

Unless you mean exposing the seed in order to be able to write it down somewhere and not publicly exposing it OP is referring to).

The OP was actually referring to wallet recovery seed and he asked if 21 out 24 get exposed, is it possible for anyone to crack remain 3 and my own answer is yes because some people totally good in doing the cracking and guessing thing.

[jackg]

With my understand is good to expose your wallet seed because recovery seeds is like your best friend and it the only thing you need to maintain the safety or recover of your coins.

What? Exposing your wallet seed is the worst thing you could do with a wallet that you are using as the person it is exposed to will have access to everything in your wallet.

Unless you mean exposing the seed in order to be able to write it down somewhere and not publicly exposing it OP is referring to).

The OP was actually referring to wallet recovery seed and he asked if 21 out 24 get exposed, is it possible for anyone to crack remain 3 and my own answer is yes because some people totally good in doing the cracking and guessing thing.

If you look at the first few replies, you'd see that I understood this. And HCP and a few other users added calculations to how easy it'd be. Their calculations are an optimistic approach as it'll be much easier possibility wise as there are an even fewer number of sets than were estimated by them.