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In partikular, you cannot cause trouble by passing a wrong number of arguments (what would be devastating in BASIC or Pascal). Interestingly, the Windows API, what normally uses Pascal-calls uses C-calls for Vararg funktions, for exaclty that reason.
Most printf related bugs print mearly garbage. By passing many %X or %s you get a dump of the stack or strings, that is only rarely a hazard. You might get acess to sensitive data, but this requires a lot of knowledge about the programm, and apropriate data structures. The most damaging possible is, to overwrite the code at the return adress with %n, what crashes the programm, but is probably insuficient to jump to malware. --[[Special:Contributions/79.200.87.213|79.200.87.213]] ([[User talk:79.200.87.213|talk]]) 23:48, 6 February 2015 (UTC)
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