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/libapache2-mod-defensible-1.4/mod_defensible.c

FINAL RESULTS:

data/libapache2-mod-defensible-1.4/mod_defensible.c:262:11:  [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).
    len = strlen(ip); 
data/libapache2-mod-defensible-1.4/mod_defensible.c:312:21:  [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).
        len_dnsbl = strlen(srv_elts[i]);
data/libapache2-mod-defensible-1.4/mod_defensible.c:316:9:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
        strncpy(hostdnsbl, revip, len);
data/libapache2-mod-defensible-1.4/mod_defensible.c:317:9:  [1] (buffer) strncat:
  Easily used incorrectly (e.g., incorrectly computing the correct maximum
  size to add) [MS-banned] (CWE-120). Consider strcat_s, strlcat, snprintf,
  or automatically resizing strings. Risk is low because the source is a
  constant character.
        strncat(hostdnsbl, ".", 1);
data/libapache2-mod-defensible-1.4/mod_defensible.c:318:9:  [1] (buffer) strncat:
  Easily used incorrectly (e.g., incorrectly computing the correct maximum
  size to add) [MS-banned] (CWE-120). Consider strcat_s, strlcat, snprintf,
  or automatically resizing strings.
        strncat(hostdnsbl, srv_elts[i], len_dnsbl);

ANALYSIS SUMMARY:

Hits = 5
Lines analyzed = 415 in approximately 0.03 seconds (14149 lines/second)
Physical Source Lines of Code (SLOC) = 288
Hits@level = [0]   0 [1]   5 [2]   0 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]   5 [1+]   5 [2+]   0 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 17.3611 [1+] 17.3611 [2+]   0 [3+]   0 [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.