diff --git a/phpseclib/Exception/OutOfBoundsException.php b/phpseclib/Exception/OutOfBoundsException.php
new file mode 100644
index 00000000..98c2c956
--- /dev/null
+++ b/phpseclib/Exception/OutOfBoundsException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace phpseclib3\Exception;
+
+class OutOfBoundsException extends \OutOfBoundsException implements ExceptionInterface
+{
+}
diff --git a/phpseclib/Math/BinaryField.php b/phpseclib/Math/BinaryField.php
index 22a983b2..01b6af76 100644
--- a/phpseclib/Math/BinaryField.php
+++ b/phpseclib/Math/BinaryField.php
@@ -17,6 +17,7 @@ declare(strict_types=1);
 namespace phpseclib3\Math;
 
 use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Exception\OutOfBoundsException;
 use phpseclib3\Math\BinaryField\Integer;
 use phpseclib3\Math\Common\FiniteField;
 
@@ -57,7 +58,7 @@ class BinaryField extends FiniteField
                http://tools.ietf.org/html/rfc4253#section-6.1 (The Secure Shell (SSH) Transport Layer Protocol) says
                "implementations SHOULD check that the packet length is reasonable in order for the implementation to
                 avoid denial of service and/or buffer overflow attacks" */
-            throw new \OutOfBoundsException('Degrees larger than 571 are not supported');
+            throw new OutOfBoundsException('Degrees larger than 571 are not supported');
         }
         $val = str_repeat('0', $m) . '1';
         foreach ($indices as $index) {
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 5bc72275..72dbe56c 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -2066,7 +2066,7 @@ class SSH2
             [$type] = Strings::unpackSSH2('C', $response);
 
             if ($type == MessageType::EXT_INFO) {
-                list($nr_extensions) = Strings::unpackSSH2('N', $response);
+                [$nr_extensions] = Strings::unpackSSH2('N', $response);
                 for ($i = 0; $i < $nr_extensions; $i++) {
                     [$extension_name, $extension_value] = Strings::unpackSSH2('ss', $response);
                     if ($extension_name == 'server-sig-algs') {
@@ -2075,12 +2075,10 @@ class SSH2
                 }
 
                 $response = $this->get_binary_packet();
-                list($type) = Strings::unpackSSH2('C', $response);
+                [$type] = Strings::unpackSSH2('C', $response);
             }
 
-            list($service) = Strings::unpackSSH2('s', $response);
-
-            [$type, $service] = Strings::unpackSSH2('Cs', $response);
+            [$service] = Strings::unpackSSH2('s', $response);
             if ($type != MessageType::SERVICE_ACCEPT || $service != 'ssh-userauth') {
                 $this->disconnect_helper(DisconnectReason::PROTOCOL_ERROR);
                 throw new UnexpectedValueException('Expected SSH_MSG_SERVICE_ACCEPT');