#564:

cidr notation can only be 1 through 32

lib/Froxlor/Validate/Validate.php

@@ -123,6 +123,9 @@ class Validate
 			$org_ip = $ip;
 			$ip_cidr = explode("/", $ip);
 			if (count($ip_cidr) === 2) {
+			    if(in_array((int)$ip_cidr[1], array_values(range(1, 32)), TRUE) === false) {
+                    \Froxlor\UI\Response::standard_error($lng, $ip, $throw_exception);
+                }
 			    if (self::is_ipv6($ip)) {
                     //MySQL does not handle CIDR of IPv6 addresses, return error
                     if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false) {