diff --git a/server/src/main/java/com/cloud/network/NetworkModelImpl.java b/server/src/main/java/com/cloud/network/NetworkModelImpl.java
index 07305c0e6418..ed7ec34b9e5d 100644
--- a/server/src/main/java/com/cloud/network/NetworkModelImpl.java
+++ b/server/src/main/java/com/cloud/network/NetworkModelImpl.java
@@ -2743,7 +2743,8 @@ public ConfigKey<?>[] getConfigKeys() {
     @Override
     public String getValidNetworkCidr(Network guestNetwork) {
         String networkCidr = guestNetwork.getNetworkCidr();
-        return networkCidr == null ? guestNetwork.getCidr() : networkCidr;
+        String cidr = networkCidr == null ? guestNetwork.getCidr() : networkCidr;
+        return com.cloud.utils.StringUtils.getFirstValueFromCommaSeparatedString(cidr);
     }
 
     @Override