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/maildir-filter-1.20/maildir-filter.c

FINAL RESULTS:

data/maildir-filter-1.20/maildir-filter.c:57:11:  [3] (buffer) getopt:
  Some older implementations do not protect against internal buffer overflows
  (CWE-120, CWE-20). Check implementation on installation, or limit the size
  of all string inputs.
	while((c=getopt(argc,argv,"r:kd:pDibVnH"))>0) {
data/maildir-filter-1.20/maildir-filter.c:104:5:  [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[BUFSIZ];
data/maildir-filter-1.20/maildir-filter.c:218:2:  [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 fname[BUFSIZ];
data/maildir-filter-1.20/maildir-filter.c:219:2:  [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 tmpname[BUFSIZ];
data/maildir-filter-1.20/maildir-filter.c:230:5:  [2] (misc) fopen:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
	fp=fopen(tmpname, "w");
data/maildir-filter-1.20/maildir-filter.c:106:14:  [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).
		msg_len += strlen(line);
data/maildir-filter-1.20/maildir-filter.c:138:35:  [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).
			fwrite(message[c],sizeof(char),strlen(message[c]),stdout);
data/maildir-filter-1.20/maildir-filter.c:150:66:  [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).
				ret=pcre_exec(regexp,(const pcre_extra *)reg_info,message[c],strlen(message[c]),0,0 /* opt */,NULL,0);
data/maildir-filter-1.20/maildir-filter.c:236:34:  [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).
		fwrite(message[c],sizeof(char),strlen(message[c]),fp);

ANALYSIS SUMMARY:

Hits = 9
Lines analyzed = 245 in approximately 0.02 seconds (10040 lines/second)
Physical Source Lines of Code (SLOC) = 217
Hits@level = [0]  27 [1]   4 [2]   4 [3]   1 [4]   0 [5]   0
Hits@level+ = [0+]  36 [1+]   9 [2+]   5 [3+]   1 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 165.899 [1+] 41.4747 [2+] 23.0415 [3+] 4.60829 [4+]   0 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
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.