diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index 2b87976..9c75912 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -392,17 +392,15 @@ route[CHECK_RETRANS]
     }
 }
 
-
-modparam("htable", "htable", "insane=>size=32;autoexpire=120;initval=0;updateexpire=1;")
-
 route[SANITY_CHECK]
 {
-    if($sht(insane=>$si:$sp) > 3) {
+    ## CVE-2018-14767
+    if($(hdr(To)[1]) != $null) {
+        xlog("second To header not null - dropping message");
         drop;
-    };
+    }
 
     if (!sanity_check()) {
-        $var(insane) = $shtinc(insane=>$si:$sp);
         xlog("L_WARN", "$ci|end|message from $si:$sp is insane ($var(insane))\n");
         drop;
     }