diff --git a/app/code/Magento/Backend/Block/Widget/Grid/Column/Renderer/Massaction.php b/app/code/Magento/Backend/Block/Widget/Grid/Column/Renderer/Massaction.php
index 320713f8b57c..a611e91f32f0 100644
--- a/app/code/Magento/Backend/Block/Widget/Grid/Column/Renderer/Massaction.php
+++ b/app/code/Magento/Backend/Block/Widget/Grid/Column/Renderer/Massaction.php
@@ -65,7 +65,7 @@ public function render(\Magento\Framework\DataObject $row)
      */
     protected function _getCheckboxHtml($value, $checked)
     {
-        $id = 'id_' . rand(0, 999);
+        $id = 'id_' . random_int(0, 999);
         $html = '<label class="data-grid-checkbox-cell-inner" for="'. $id .'">';
         $html .= '<input type="checkbox" name="' . $this->getColumn()->getName() . '" ';
         $html .= 'id="' . $id . '" data-role="select-row"';
diff --git a/app/code/Magento/Catalog/Model/Indexer/Category/Product/AbstractAction.php b/app/code/Magento/Catalog/Model/Indexer/Category/Product/AbstractAction.php
index b44a173e1b91..79e5affd649c 100644
--- a/app/code/Magento/Catalog/Model/Indexer/Category/Product/AbstractAction.php
+++ b/app/code/Magento/Catalog/Model/Indexer/Category/Product/AbstractAction.php
@@ -597,7 +597,7 @@ protected function getTemporaryTreeIndexTableName()
         if (empty($this->tempTreeIndexTableName)) {
             $this->tempTreeIndexTableName = $this->connection->getTableName('temp_catalog_category_tree_index')
                 . '_'
-                . substr(md5(time() . rand(0, 999999999)), 0, 8);
+                . substr(md5(time() . random_int(0, 999999999)), 0, 8);
         }
 
         return $this->tempTreeIndexTableName;
diff --git a/app/code/Magento/SalesRule/Model/Coupon/Codegenerator.php b/app/code/Magento/SalesRule/Model/Coupon/Codegenerator.php
index 1d86ec2b01b3..c89677f0e909 100644
--- a/app/code/Magento/SalesRule/Model/Coupon/Codegenerator.php
+++ b/app/code/Magento/SalesRule/Model/Coupon/Codegenerator.php
@@ -38,7 +38,7 @@ public function generateCode()
         $length = $this->getActualLength();
         $code = '';
         for ($i = 0, $indexMax = strlen($alphabet) - 1; $i < $length; ++$i) {
-            $code .= substr($alphabet, mt_rand(0, $indexMax), 1);
+            $code .= substr($alphabet, random_int(0, $indexMax), 1);
         }
 
         return $code;
@@ -54,7 +54,7 @@ protected function getActualLength()
         $lengthMin = $this->getLengthMin() ? $this->getLengthMin() : static::DEFAULT_LENGTH_MIN;
         $lengthMax = $this->getLengthMax() ? $this->getLengthMax() : static::DEFAULT_LENGTH_MAX;
 
-        return $this->getLength() ? $this->getLength() : mt_rand($lengthMin, $lengthMax);
+        return $this->getLength() ? $this->getLength() : random_int($lengthMin, $lengthMax);
     }
 
     /**
diff --git a/app/code/Magento/SalesRule/Model/Rule.php b/app/code/Magento/SalesRule/Model/Rule.php
index f4469213bd96..59efdf5eb3f6 100644
--- a/app/code/Magento/SalesRule/Model/Rule.php
+++ b/app/code/Magento/SalesRule/Model/Rule.php
@@ -521,7 +521,7 @@ public function acquireCoupon($saveNewlyCreated = true, $saveAttemptCount = 10)
                         $coupon->setCode(
                             $couponCode . self::getCouponCodeGenerator()->getDelimiter() . sprintf(
                                 '%04u',
-                                rand(0, 9999)
+                                random_int(0, 9999)
                             )
                         );
                         continue;
diff --git a/lib/internal/Magento/Framework/Encryption/Crypt.php b/lib/internal/Magento/Framework/Encryption/Crypt.php
index c304cdb23f85..5f368f0d5b79 100644
--- a/lib/internal/Magento/Framework/Encryption/Crypt.php
+++ b/lib/internal/Magento/Framework/Encryption/Crypt.php
@@ -75,7 +75,7 @@ public function __construct(
                 $abc = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
                 $initVector = '';
                 for ($i = 0; $i < $initVectorSize; $i++) {
-                    $initVector .= $abc[rand(0, strlen($abc) - 1)];
+                    $initVector .= $abc[random_int(0, strlen($abc) - 1)];
                 }
             } elseif (false === $initVector) {
                 /* Set vector to zero bytes to not use it */
diff --git a/lib/internal/Magento/Framework/Setup/BackendFrontnameGenerator.php b/lib/internal/Magento/Framework/Setup/BackendFrontnameGenerator.php
index ae123e15da23..224f2024ba95 100644
--- a/lib/internal/Magento/Framework/Setup/BackendFrontnameGenerator.php
+++ b/lib/internal/Magento/Framework/Setup/BackendFrontnameGenerator.php
@@ -29,6 +29,6 @@ class BackendFrontnameGenerator
     public static function generate()
     {
         return self::ADMIN_AREA_PATH_PREFIX
-            . substr(base_convert(rand(0, PHP_INT_MAX), 10, 36), 0, self::ADMIN_AREA_PATH_RANDOM_PART_LENGTH);
+            . substr(base_convert(random_int(0, PHP_INT_MAX), 10, 36), 0, self::ADMIN_AREA_PATH_RANDOM_PART_LENGTH);
     }
 }
diff --git a/lib/internal/Magento/Framework/Webapi/ErrorProcessor.php b/lib/internal/Magento/Framework/Webapi/ErrorProcessor.php
index 0655bfda0bbc..b124c417148d 100644
--- a/lib/internal/Magento/Framework/Webapi/ErrorProcessor.php
+++ b/lib/internal/Magento/Framework/Webapi/ErrorProcessor.php
@@ -317,7 +317,7 @@ public function apiShutdownFunction()
     protected function _saveFatalErrorReport($reportData)
     {
         $this->directoryWrite->create('report/api');
-        $reportId = abs(intval(microtime(true) * rand(100, 1000)));
+        $reportId = abs(intval(microtime(true) * random_int(100, 1000)));
         $this->directoryWrite->writeFile('report/api/' . $reportId, $this->serializer->serialize($reportData));
         return $reportId;
     }
diff --git a/pub/errors/processor.php b/pub/errors/processor.php
index 896538853485..7240707f642c 100644
--- a/pub/errors/processor.php
+++ b/pub/errors/processor.php
@@ -463,7 +463,7 @@ protected function _setReportData($reportData)
     public function saveReport($reportData)
     {
         $this->reportData = $reportData;
-        $this->reportId   = abs(intval(microtime(true) * rand(100, 1000)));
+        $this->reportId   = abs(intval(microtime(true) * random_int(100, 1000)));
         $this->_reportFile = $this->_reportDir . '/' . $this->reportId;
         $this->_setReportData($reportData);
 
diff --git a/setup/src/Magento/Setup/Model/Address/AddressDataGenerator.php b/setup/src/Magento/Setup/Model/Address/AddressDataGenerator.php
index 2d450a4374c5..1bbd152f2ba4 100644
--- a/setup/src/Magento/Setup/Model/Address/AddressDataGenerator.php
+++ b/setup/src/Magento/Setup/Model/Address/AddressDataGenerator.php
@@ -18,7 +18,7 @@ class AddressDataGenerator
     public function generateAddress()
     {
         return [
-            'postcode' => mt_rand(10000, 99999)
+            'postcode' => random_int(10000, 99999)
         ];
     }
 }
diff --git a/setup/src/Magento/Setup/Model/DataGenerator.php b/setup/src/Magento/Setup/Model/DataGenerator.php
index 7a039388180a..540433e5aa3e 100644
--- a/setup/src/Magento/Setup/Model/DataGenerator.php
+++ b/setup/src/Magento/Setup/Model/DataGenerator.php
@@ -67,12 +67,12 @@ protected function readData()
      */
     public function generate($minAmountOfWords, $maxAmountOfWords, $key = null)
     {
-        $numberOfWords = mt_rand($minAmountOfWords, $maxAmountOfWords);
+        $numberOfWords = random_int($minAmountOfWords, $maxAmountOfWords);
         $result = '';
 
         if ($key === null || !array_key_exists($key, $this->generatedValues)) {
             for ($i = 0; $i < $numberOfWords; $i++) {
-                $result .= ' ' . $this->dictionaryData[mt_rand(0, count($this->dictionaryData) - 1)];
+                $result .= ' ' . $this->dictionaryData[random_int(0, count($this->dictionaryData) - 1)];
             }
             $result = trim($result);
 
diff --git a/setup/src/Magento/Setup/Model/Description/DescriptionGenerator.php b/setup/src/Magento/Setup/Model/Description/DescriptionGenerator.php
index 807e1fde7d90..a790bfdbe608 100644
--- a/setup/src/Magento/Setup/Model/Description/DescriptionGenerator.php
+++ b/setup/src/Magento/Setup/Model/Description/DescriptionGenerator.php
@@ -63,7 +63,7 @@ public function generate()
      */
     private function generateRawDescription()
     {
-        $paragraphsCount = mt_rand(
+        $paragraphsCount = random_int(
             $this->descriptionConfig['paragraphs']['count-min'],
             $this->descriptionConfig['paragraphs']['count-max']
         );
diff --git a/setup/src/Magento/Setup/Model/Description/DescriptionParagraphGenerator.php b/setup/src/Magento/Setup/Model/Description/DescriptionParagraphGenerator.php
index 50544e6ea972..57ece1f9558c 100644
--- a/setup/src/Magento/Setup/Model/Description/DescriptionParagraphGenerator.php
+++ b/setup/src/Magento/Setup/Model/Description/DescriptionParagraphGenerator.php
@@ -39,7 +39,7 @@ public function __construct(
      */
     public function generate()
     {
-        $sentencesCount = mt_rand(
+        $sentencesCount = random_int(
             $this->paragraphConfig['sentences']['count-min'],
             $this->paragraphConfig['sentences']['count-max']
         );
diff --git a/setup/src/Magento/Setup/Model/Description/DescriptionSentenceGenerator.php b/setup/src/Magento/Setup/Model/Description/DescriptionSentenceGenerator.php
index 299b4b50bed0..10b07e7e1c7a 100644
--- a/setup/src/Magento/Setup/Model/Description/DescriptionSentenceGenerator.php
+++ b/setup/src/Magento/Setup/Model/Description/DescriptionSentenceGenerator.php
@@ -39,7 +39,7 @@ public function __construct(
      */
     public function generate()
     {
-        $sentenceWordsCount = mt_rand(
+        $sentenceWordsCount = random_int(
             $this->sentenceConfig['words']['count-min'],
             $this->sentenceConfig['words']['count-max']
         );
diff --git a/setup/src/Magento/Setup/Model/Description/Mixin/BoldMixin.php b/setup/src/Magento/Setup/Model/Description/Mixin/BoldMixin.php
index db208adc67de..927759c4bfa7 100644
--- a/setup/src/Magento/Setup/Model/Description/Mixin/BoldMixin.php
+++ b/setup/src/Magento/Setup/Model/Description/Mixin/BoldMixin.php
@@ -48,7 +48,7 @@ public function apply($text)
 
         return $this->wordWrapper->wrapWords(
             $text,
-            $this->randomWordSelector->getRandomWords($rawText, mt_rand(5, 8)),
+            $this->randomWordSelector->getRandomWords($rawText, random_int(5, 8)),
             '<b>%s</b>'
         );
     }
diff --git a/setup/src/Magento/Setup/Model/Description/Mixin/Helper/RandomWordSelector.php b/setup/src/Magento/Setup/Model/Description/Mixin/Helper/RandomWordSelector.php
index 0598db218728..c7efcc7f12e0 100644
--- a/setup/src/Magento/Setup/Model/Description/Mixin/Helper/RandomWordSelector.php
+++ b/setup/src/Magento/Setup/Model/Description/Mixin/Helper/RandomWordSelector.php
@@ -27,7 +27,7 @@ public function getRandomWords($source, $count)
         $randWords = [];
         $wordsSize = count($words);
         while ($count) {
-            $randWords[] = $words[mt_rand(0, $wordsSize - 1)];
+            $randWords[] = $words[random_int(0, $wordsSize - 1)];
             $count--;
         }
 
diff --git a/setup/src/Magento/Setup/Model/Description/Mixin/ItalicMixin.php b/setup/src/Magento/Setup/Model/Description/Mixin/ItalicMixin.php
index 87e033be330c..7621bccf0877 100644
--- a/setup/src/Magento/Setup/Model/Description/Mixin/ItalicMixin.php
+++ b/setup/src/Magento/Setup/Model/Description/Mixin/ItalicMixin.php
@@ -48,7 +48,7 @@ public function apply($text)
 
         return $this->wordWrapper->wrapWords(
             $text,
-            $this->randomWordSelector->getRandomWords($rawText, mt_rand(5, 8)),
+            $this->randomWordSelector->getRandomWords($rawText, random_int(5, 8)),
             '<i>%s</i>'
         );
     }
diff --git a/setup/src/Magento/Setup/Model/Description/Mixin/SpanMixin.php b/setup/src/Magento/Setup/Model/Description/Mixin/SpanMixin.php
index ed5a83612946..fe53ebef535a 100644
--- a/setup/src/Magento/Setup/Model/Description/Mixin/SpanMixin.php
+++ b/setup/src/Magento/Setup/Model/Description/Mixin/SpanMixin.php
@@ -48,7 +48,7 @@ public function apply($text)
 
         return $this->wordWrapper->wrapWords(
             $text,
-            $this->randomWordSelector->getRandomWords($rawText, mt_rand(5, 8)),
+            $this->randomWordSelector->getRandomWords($rawText, random_int(5, 8)),
             '<span>%s</span>'
         );
     }
diff --git a/setup/src/Magento/Setup/Model/Dictionary.php b/setup/src/Magento/Setup/Model/Dictionary.php
index 630d35092d0f..52f7cc1bb514 100644
--- a/setup/src/Magento/Setup/Model/Dictionary.php
+++ b/setup/src/Magento/Setup/Model/Dictionary.php
@@ -40,7 +40,7 @@ public function getRandWord()
             $this->readDictionary();
         }
 
-        $randIndex = mt_rand(0, count($this->dictionary) - 1);
+        $randIndex = random_int(0, count($this->dictionary) - 1);
         return trim($this->dictionary[$randIndex]);
     }