diff --git a/‎src/Symfony/Component/HttpFoundation/IpUtils.php
Lines changed: 5 additions & 1 deletion b/‎src/Symfony/Component/HttpFoundation/IpUtils.php
Lines changed: 5 additions & 1 deletion
diff --git a/‎src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
Lines changed: 1 addition & 0 deletions b/‎src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
Lines changed: 1 addition & 0 deletions
@@ -64,9 +64,13 @@ public static function checkIp4($requestIp, $ip)
         if (false !== strpos($ip, '/')) {
             list($address, $netmask) = explode('/', $ip, 2);
 
-            if ($netmask < 1 || $netmask > 32) {
+            if ($netmask < 0 || $netmask > 32) {
                 return false;
             }
+
+            if ($netmask === '0') {
+                return true;
+            }
         } else {
             $address = $ip;
             $netmask = 32;
 
@@ -34,6 +34,7 @@ public function testIpv4Provider()
             array(true, '192.168.1.1', array('1.2.3.4/1', '192.168.1.0/24')),
             array(true, '192.168.1.1', array('192.168.1.0/24', '1.2.3.4/1')),
             array(false, '192.168.1.1', array('1.2.3.4/1', '4.3.2.1/1')),
+            array(true, '1.2.3.4', '0.0.0.0/0'),
         );
     }