format strings vulns in /bin/login and /usr/bin/passwd

Hello while doing a scan for format strings vulns on util-linux package 
it came back with the following results.

./login.c:398 FUNC fprintf
./login.c:425 FUNC fprintf
./login.c:597 FUNC fprintf
./login.c:614 FUNC fprintf
./login.c:775 FUNC printf
./login.c:796 FUNC fprintf
./login.c:800 FUNC fprintf
./login.c:1109 FUNC syslog
./login.c:1119 FUNC printf
./login.c:1127 FUNC fprintf
./login.c:1183 FUNC fprintf
./login.c:1190 FUNC fprintf
./login.c:1201 FUNC fprintf

./passwd.c:161 FUNC printf
./passwd.c:174 FUNC printf
./passwd.c:175 FUNC printf
./passwd.c:176 FUNC printf
./passwd.c:181 FUNC printf
./passwd.c:186 FUNC printf
./passwd.c:197 FUNC printf
./passwd.c:204 FUNC printf
./passwd.c:222 FUNC printf
./passwd.c:223 FUNC printf
./passwd.c:277 FUNC fprintf
./passwd.c:316 FUNC printf
./passwd.c:323 FUNC printf
./passwd.c:331 FUNC printf
./passwd.c:401 FUNC syslog
./passwd.c:410 FUNC printf
./passwd.c:414 FUNC printf
./passwd.c:420 FUNC printf

There is also a few other on other programs but i thought these 2 would 
be most important since passwd is suid and login could be exploited 
remotly. I am not very experianced in format strings any help/commets 
would be great. Would these be able to get exploited?

Regards

Faulty@xxxxxxx

www.b0f.net