Index: /trunk/src/VBox/Runtime/common/misc/cidr.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/misc/cidr.cpp	(revision 29839)
+++ /trunk/src/VBox/Runtime/common/misc/cidr.cpp	(revision 29840)
@@ -90,4 +90,9 @@
         else 
             return VERR_INVALID_PARAMETER;
+
+        if(cDelimiter > 3)
+            /* no more than four octets */
+            return VERR_INVALID_PARAMETER;
+
         rc = RTStrToUInt8Ex(pszNext + 1, &pszNext, 10, &addr[cDelimiter]);
         if (rc == VWRN_NUMBER_TOO_BIG)