Like any fluorescent light CFLs can burn out and cease to provide light and thus must be replaced. But if you mean literally exploding and bursting into pieces, no, they are not supposed to. They are test before by shipped out to market to avoid just such occurrences. That said there are always defective bulbs that might get through the testing or might have been damaged after testing, so it is possible to have a blow out. Secondly, very cheap bulbs sometimes are put on the market without testing and the risk of blow out is higher, so shop consciously!
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