CVE-2015-7547 vulnerability, its mentioned,version of glibc below 2.23 are vulnerable.
if the glibc used is below 2.23 , but application does not uses getaddrinfo() function, Is the application still vulnerable?
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While you might not use the function in question, some other library function might use is somewhere, which potentially opens the vulnerability for exploit.
It is therefor hard to know without actual (pen-) testing whether your application is vulnerable to this vulnerability.