diff --git a/neutron/extensions/securitygroup.py b/neutron/extensions/securitygroup.py
index 2e65aed2c6b..1450b694489 100644
--- a/neutron/extensions/securitygroup.py
+++ b/neutron/extensions/securitygroup.py
@@ -167,7 +167,7 @@ def convert_ip_prefix_to_cidr(ip_prefix):
     try:
         cidr = netaddr.IPNetwork(ip_prefix)
         return str(cidr)
-    except (TypeError, netaddr.AddrFormatError):
+    except (ValueError, TypeError, netaddr.AddrFormatError):
         raise qexception.InvalidCIDR(input=ip_prefix)