Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/poppassd-1.8.5/poppassd.c

FINAL RESULTS:

data/poppassd-1.8.5/poppassd.c:98:2:  [4] (format) vfprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
	vfprintf (stdout, fmt, ap);
data/poppassd-1.8.5/poppassd.c:86:1:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
char oldpass[BUFSIZE];
data/poppassd-1.8.5/poppassd.c:87:1:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
char newpass[BUFSIZE];
data/poppassd-1.8.5/poppassd.c:176:6:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
     char line[BUFSIZE];
data/poppassd-1.8.5/poppassd.c:177:6:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
     char user[BUFSIZE];
data/poppassd-1.8.5/poppassd.c:178:6:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
     char emess[BUFSIZE];
data/poppassd-1.8.5/poppassd.c:195:25:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
     if( strlen(line) > atoi(MAX_LEN_USERNAME) ) {
data/poppassd-1.8.5/poppassd.c:196:54:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
	  WriteToClient ("500 Username too long (max %d).", atoi(MAX_LEN_USERNAME));
data/poppassd-1.8.5/poppassd.c:213:25:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
     if( strlen(line) > atoi(MAX_LEN_PASS) )
data/poppassd-1.8.5/poppassd.c:216:9:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
			     atoi(MAX_LEN_PASS) );
data/poppassd-1.8.5/poppassd.c:195:10:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
     if( strlen(line) > atoi(MAX_LEN_USERNAME) ) {
data/poppassd-1.8.5/poppassd.c:200:10:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
     if (strlen (user) == 0 )
data/poppassd-1.8.5/poppassd.c:213:10:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
     if( strlen(line) > atoi(MAX_LEN_PASS) )
data/poppassd-1.8.5/poppassd.c:220:9:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
     if(strlen(oldpass) == 0) 
data/poppassd-1.8.5/poppassd.c:249:10:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
     if (strlen (newpass) == 0)

ANALYSIS SUMMARY:

Hits = 15
Lines analyzed = 273 in approximately 0.04 seconds (7425 lines/second)
Physical Source Lines of Code (SLOC) = 191
Hits@level = [0]   8 [1]   5 [2]   9 [3]   0 [4]   1 [5]   0
Hits@level+ = [0+]  23 [1+]  15 [2+]  10 [3+]   1 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 120.419 [1+] 78.534 [2+] 52.356 [3+] 5.2356 [4+] 5.2356 [5+]   0
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.