diff --git a/utils/src/main/java/com/cloud/utils/net/NetUtils.java b/utils/src/main/java/com/cloud/utils/net/NetUtils.java
index feaac8f7f8b..b87292aecb5 100644
--- a/utils/src/main/java/com/cloud/utils/net/NetUtils.java
+++ b/utils/src/main/java/com/cloud/utils/net/NetUtils.java
@@ -1182,6 +1182,9 @@ public class NetUtils {
     }
 
     public static boolean isValidCidrList(final String cidrList) {
+        if (StringUtils.isBlank(cidrList)) {
+            return false;
+        }
         for (final String guestCidr : cidrList.split(",")) {
             if (!isValidIp4Cidr(guestCidr)) {
                 return false;