diff --git a/cmake/FindCUDNN.cmake b/cmake/FindCUDNN.cmake
index e115f80347..90d8b2ea78 100644
--- a/cmake/FindCUDNN.cmake
+++ b/cmake/FindCUDNN.cmake
@@ -65,7 +65,11 @@ endif()
 
 # extract version from the include
 if(CUDNN_INCLUDE_DIR)
-  file(READ "${CUDNN_INCLUDE_DIR}/cudnn.h" CUDNN_H_CONTENTS)
+  if(EXISTS "${CUDNN_INCLUDE_DIR}/cudnn_version.h")
+    file(READ "${CUDNN_INCLUDE_DIR}/cudnn_version.h" CUDNN_H_CONTENTS)
+  else()
+    file(READ "${CUDNN_INCLUDE_DIR}/cudnn.h" CUDNN_H_CONTENTS)
+  endif()
 
   string(REGEX MATCH "define CUDNN_MAJOR ([0-9]+)" _ "${CUDNN_H_CONTENTS}")
   set(CUDNN_MAJOR_VERSION ${CMAKE_MATCH_1} CACHE INTERNAL "")
diff --git a/cmake/OpenCVDetectCUDA.cmake b/cmake/OpenCVDetectCUDA.cmake
index 58807bc0f1..3d5c409cc3 100644
--- a/cmake/OpenCVDetectCUDA.cmake
+++ b/cmake/OpenCVDetectCUDA.cmake
@@ -31,6 +31,11 @@ endif()
 
 if(CUDA_FOUND)
   set(HAVE_CUDA 1)
+  if(CUDA_VERSION VERSION_GREATER_EQUAL "11.0")
+    # CUDA 11.0 removes nppicom
+    ocv_list_filterout(CUDA_nppi_LIBRARY "nppicom")
+    ocv_list_filterout(CUDA_npp_LIBRARY "nppicom")
+  endif()
 
   if(WITH_CUFFT)
     set(HAVE_CUFFT 1)
diff --git a/modules/dnn/CMakeLists.txt b/modules/dnn/CMakeLists.txt
index e8c23f6a44..ed1557520a 100644
--- a/modules/dnn/CMakeLists.txt
+++ b/modules/dnn/CMakeLists.txt
@@ -21,7 +21,15 @@ if(OPENCV_DNN_OPENCL AND HAVE_OPENCL)
   add_definitions(-DCV_OCL4DNN=1)
 endif()
 
-ocv_option(OPENCV_DNN_CUDA "Build with CUDA support" HAVE_CUDA AND HAVE_CUBLAS AND HAVE_CUDNN)
+if(NOT DEFINED OPENCV_DNN_CUDA AND HAVE_CUDNN AND CUDNN_VERSION VERSION_LESS 8.0)
+  message(STATUS "DNN: CUDNN 8.0 is not supported yes. Details: https://github.com/opencv/opencv/issues/17496")
+endif()
+ocv_option(OPENCV_DNN_CUDA "Build with CUDA support"
+    HAVE_CUDA
+    AND HAVE_CUBLAS
+    AND HAVE_CUDNN
+    AND CUDNN_VERSION VERSION_LESS 8.0
+)
 
 if(OPENCV_DNN_CUDA AND HAVE_CUDA AND HAVE_CUBLAS AND HAVE_CUDNN)
   add_definitions(-DCV_CUDA4DNN=1)