diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 640897ea16..6424becaa7 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -23,6 +23,7 @@ Yii Framework 2 Change Log
 - Bug #18898: Fix `yii\helpers\Inflector::camel2words()` to work with words ending with 0 (michaelarnauts)
 - Enh #18904: Improve Captcha client-side validation (hexkir)
 - Bug #18913: Add filename validation for `MessageSource::getMessageFilePath()` (uaoleg)
+- Bug #18909: Fix bug with binding default action parameters for controllers (bizley)
 
 
 2.0.43 August 09, 2021
diff --git a/framework/base/Controller.php b/framework/base/Controller.php
index 8ea901c37b..0c79060cef 100644
--- a/framework/base/Controller.php
+++ b/framework/base/Controller.php
@@ -563,10 +563,6 @@ class Controller extends Component implements ViewContextInterface
      */
     final protected function bindInjectedParams(\ReflectionType $type, $name, &$args, &$requestedParams)
     {
-        if (!$type instanceof \ReflectionNamedType || $type->isBuiltin()) {
-            return;
-        }
-
         // Since it is not a builtin type it must be DI injection.
         $typeName = $type->getName();
         if (($component = $this->module->get($name, false)) instanceof $typeName) {
diff --git a/framework/console/Controller.php b/framework/console/Controller.php
index 57a6635474..6fb573db94 100644
--- a/framework/console/Controller.php
+++ b/framework/console/Controller.php
@@ -226,7 +226,12 @@ class Controller extends \yii\base\Controller
                 }
                 $args[] = $actionParams[$key] = $params[$key];
                 unset($params[$key]);
-            } elseif (PHP_VERSION_ID >= 70100 && ($type = $param->getType()) !== null) {
+            } elseif (
+                PHP_VERSION_ID >= 70100
+                && ($type = $param->getType()) !== null
+                && $type instanceof \ReflectionNamedType
+                && !$type->isBuiltin()
+            ) {
                 try {
                     $this->bindInjectedParams($type, $name, $args, $requestedParams);
                 } catch (\yii\base\Exception $e) {
diff --git a/framework/web/Controller.php b/framework/web/Controller.php
index 5eac7ee534..2913e1993e 100644
--- a/framework/web/Controller.php
+++ b/framework/web/Controller.php
@@ -177,7 +177,12 @@ class Controller extends \yii\base\Controller
                 }
                 $args[] = $actionParams[$name] = $params[$name];
                 unset($params[$name]);
-            } elseif (PHP_VERSION_ID >= 70100 && ($type = $param->getType()) !== null) {
+            } elseif (
+                PHP_VERSION_ID >= 70100
+                && ($type = $param->getType()) !== null
+                && $type instanceof \ReflectionNamedType
+                && !$type->isBuiltin()
+            ) {
                 try {
                     $this->bindInjectedParams($type, $name, $args, $requestedParams);
                 } catch (HttpException $e) {