diff --git a/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php b/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php
index c3261814f..421ddaba4 100644
--- a/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php
+++ b/ModelDescriber/Annotations/SymfonyConstraintAnnotationReader.php
@@ -76,13 +76,21 @@ public function updateProperty($reflection, OA\Property $property): void
             } elseif ($annotation instanceof Assert\Regex) {
                 $this->appendPattern($property, $annotation->getHtmlPattern());
             } elseif ($annotation instanceof Assert\Count) {
-                $property->minItems = (int) $annotation->min;
-                $property->maxItems = (int) $annotation->max;
+                if (isset($annotation->min)) {
+                    $property->minItems = (int) $annotation->min;
+                }
+                if (isset($annotation->max)) {
+                    $property->maxItems = (int) $annotation->max;
+                }
             } elseif ($annotation instanceof Assert\Choice) {
                 $this->applyEnumFromChoiceConstraint($property, $annotation, $reflection);
             } elseif ($annotation instanceof Assert\Range) {
-                $property->minimum = (int) $annotation->min;
-                $property->maximum = (int) $annotation->max;
+                if (isset($annotation->min)) {
+                    $property->minimum = (int) $annotation->min;
+                }
+                if (isset($annotation->max)) {
+                    $property->maximum = (int) $annotation->max;
+                }
             } elseif ($annotation instanceof Assert\LessThan) {
                 $property->exclusiveMaximum = true;
                 $property->maximum = (int) $annotation->value;
diff --git a/Tests/ModelDescriber/Annotations/SymfonyConstraintAnnotationReaderTest.php b/Tests/ModelDescriber/Annotations/SymfonyConstraintAnnotationReaderTest.php
index 6afa2d67b..d3c96f347 100644
--- a/Tests/ModelDescriber/Annotations/SymfonyConstraintAnnotationReaderTest.php
+++ b/Tests/ModelDescriber/Annotations/SymfonyConstraintAnnotationReaderTest.php
@@ -244,4 +244,148 @@ public function provideLengthConstraintDoesNotSetMinLengthIfMinIsNotSet(): itera
             }];
         }
     }
+
+    /**
+     * @param object $entity
+     * @group https://github.com/nelmio/NelmioApiDocBundle/issues/1821
+     * @dataProvider provideCountConstraintDoesNotSetMinItemsIfMinIsNotSet
+     */
+    public function testCountConstraintDoesNotSetMinItemsIfMinIsNotSet($entity)
+    {
+        $schema = new OA\Schema([]);
+        $schema->merge([new OA\Property(['property' => 'property1'])]);
+
+        $symfonyConstraintAnnotationReader = new SymfonyConstraintAnnotationReader(new AnnotationReader());
+        $symfonyConstraintAnnotationReader->setSchema($schema);
+
+        $symfonyConstraintAnnotationReader->updateProperty(new \ReflectionProperty($entity, 'property1'), $schema->properties[0]);
+
+        $this->assertSame(OA\UNDEFINED, $schema->properties[0]->minItems);
+        $this->assertSame(10, $schema->properties[0]->maxItems);
+    }
+
+    public function provideCountConstraintDoesNotSetMinItemsIfMinIsNotSet(): iterable
+    {
+        yield 'Annotations' => [new class() {
+            /**
+             * @Assert\Count(max = 10)
+             */
+            private $property1;
+        }];
+
+        if (\PHP_VERSION_ID >= 80000) {
+            yield 'Attributes' => [new class() {
+                #[Assert\Count(max: 10)]
+                private $property1;
+            }];
+        }
+    }
+
+    /**
+     * @param object $entity
+     * @group https://github.com/nelmio/NelmioApiDocBundle/issues/1821
+     * @dataProvider provideCountConstraintDoesNotSetMaxItemsIfMaxIsNotSet
+     */
+    public function testCountConstraintDoesNotSetMaxItemsIfMaxIsNotSet($entity)
+    {
+        $schema = new OA\Schema([]);
+        $schema->merge([new OA\Property(['property' => 'property1'])]);
+
+        $symfonyConstraintAnnotationReader = new SymfonyConstraintAnnotationReader(new AnnotationReader());
+        $symfonyConstraintAnnotationReader->setSchema($schema);
+
+        $symfonyConstraintAnnotationReader->updateProperty(new \ReflectionProperty($entity, 'property1'), $schema->properties[0]);
+
+        $this->assertSame(OA\UNDEFINED, $schema->properties[0]->maxItems);
+        $this->assertSame(10, $schema->properties[0]->minItems);
+    }
+
+    public function provideCountConstraintDoesNotSetMaxItemsIfMaxIsNotSet(): iterable
+    {
+        yield 'Annotations' => [new class() {
+            /**
+             * @Assert\Count(min = 10)
+             */
+            private $property1;
+        }];
+
+        if (\PHP_VERSION_ID >= 80000) {
+            yield 'Attributes' => [new class() {
+                #[Assert\Count(min: 10)]
+                private $property1;
+            }];
+        }
+    }
+
+    /**
+     * @param object $entity
+     * @group https://github.com/nelmio/NelmioApiDocBundle/issues/1822
+     * @dataProvider provideRangeConstraintDoesNotSetMaximumIfMaxIsNotSet
+     */
+    public function testRangeConstraintDoesNotSetMaximumIfMaxIsNotSet($entity)
+    {
+        $schema = new OA\Schema([]);
+        $schema->merge([new OA\Property(['property' => 'property1'])]);
+
+        $symfonyConstraintAnnotationReader = new SymfonyConstraintAnnotationReader(new AnnotationReader());
+        $symfonyConstraintAnnotationReader->setSchema($schema);
+
+        $symfonyConstraintAnnotationReader->updateProperty(new \ReflectionProperty($entity, 'property1'), $schema->properties[0]);
+
+        $this->assertSame(OA\UNDEFINED, $schema->properties[0]->maximum);
+        $this->assertSame(10, $schema->properties[0]->minimum);
+    }
+
+    public function provideRangeConstraintDoesNotSetMaximumIfMaxIsNotSet(): iterable
+    {
+        yield 'Annotations' => [new class() {
+            /**
+             * @Assert\Range(min = 10)
+             */
+            private $property1;
+        }];
+
+        if (\PHP_VERSION_ID >= 80000) {
+            yield 'Attributes' => [new class() {
+                #[Assert\Range(min: 10)]
+                private $property1;
+            }];
+        }
+    }
+
+    /**
+     * @param object $entity
+     * @group https://github.com/nelmio/NelmioApiDocBundle/issues/1822
+     * @dataProvider provideRangeConstraintDoesNotSetMinimumIfMinIsNotSet
+     */
+    public function testRangeConstraintDoesNotSetMinimumIfMinIsNotSet($entity)
+    {
+        $schema = new OA\Schema([]);
+        $schema->merge([new OA\Property(['property' => 'property1'])]);
+
+        $symfonyConstraintAnnotationReader = new SymfonyConstraintAnnotationReader(new AnnotationReader());
+        $symfonyConstraintAnnotationReader->setSchema($schema);
+
+        $symfonyConstraintAnnotationReader->updateProperty(new \ReflectionProperty($entity, 'property1'), $schema->properties[0]);
+
+        $this->assertSame(OA\UNDEFINED, $schema->properties[0]->minimum);
+        $this->assertSame(10, $schema->properties[0]->maximum);
+    }
+
+    public function provideRangeConstraintDoesNotSetMinimumIfMinIsNotSet(): iterable
+    {
+        yield 'Annotations' => [new class() {
+            /**
+             * @Assert\Range(max = 10)
+             */
+            private $property1;
+        }];
+
+        if (\PHP_VERSION_ID >= 80000) {
+            yield 'Attributes' => [new class() {
+                #[Assert\Range(max: 10)]
+                private $property1;
+            }];
+        }
+    }
 }