diff --git a/test/functional/tests/security/fuzzy/kernel/common/common.py b/test/functional/tests/security/fuzzy/kernel/common/common.py
index f485f1a..408682a 100644
--- a/test/functional/tests/security/fuzzy/kernel/common/common.py
+++ b/test/functional/tests/security/fuzzy/kernel/common/common.py
@@ -1,8 +1,9 @@
 #
 # Copyright(c) 2022 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies
 # SPDX-License-Identifier: BSD-3-Clause
 #
-
+import base64
 import os
 import posixpath
 from collections import namedtuple
@@ -29,36 +30,38 @@ def get_device_fuzz_config(device_paths: List[str]):
         raise Exception("device_paths parameter cannot be empty list")
 
     device_base_config = get_fuzz_config("device.yml")
-    device_base_config[0]['attributes']['value'] = device_paths[0]
+    device_base_config[0]["attributes"]["value"] = device_paths[0]
     if len(device_paths) > 1:
         other_valid_devices = {
-            'name': 'Hint',
-            'attributes': {
-                'name': 'ValidValues',
-                'value': ';'.join(device_paths[1:])
-            }
+            "name": "Hint",
+            "attributes": {"name": "ValidValues", "value": ";".join(device_paths[1:])},
         }
-        device_base_config[0]['children'].append(other_valid_devices)
+        device_base_config[0]["children"].append(other_valid_devices)
 
     return device_base_config
 
 
-def prepare_cas_instance(cache_device, core_device, cache_mode: CacheMode = None,
-                         cache_line_size: CacheLineSize = None,
-                         kernel_params: KernelParameters = KernelParameters(),
-                         cleaning_policy: CleaningPolicy = None, mount_point: str = None,
-                         create_partition=True):
+def prepare_cas_instance(
+    cache_device,
+    core_device,
+    cache_mode: CacheMode = None,
+    cache_line_size: CacheLineSize = None,
+    kernel_params: KernelParameters = KernelParameters(),
+    cleaning_policy: CleaningPolicy = None,
+    mount_point: str = None,
+    create_partition=True,
+):
     #  Change cleaning policy to default for Write Policy different than WB
     if cleaning_policy:
-        cleaning_policy = CleaningPolicy.DEFAULT if cache_mode != CacheMode.WB \
-            else cleaning_policy
+        cleaning_policy = CleaningPolicy.DEFAULT if cache_mode != CacheMode.WB else cleaning_policy
 
     if create_partition is True:
         cache_device.create_partitions([Size(400, Unit.MebiByte)])
         cache_device = cache_device.partitions[0]
 
-    cache = casadm.start_cache(cache_device, cache_mode, cache_line_size, 1, True,
-                               kernel_params=kernel_params)
+    cache = casadm.start_cache(
+        cache_device, cache_mode, cache_line_size, 1, True, kernel_params=kernel_params
+    )
     if cleaning_policy:
         cache.set_cleaning_policy(cleaning_policy)
 
@@ -73,24 +76,33 @@ def prepare_cas_instance(cache_device, core_device, cache_mode: CacheMode = None
 
 
 def run_cmd_and_validate(cmd, value_name: str, is_valid: bool):
+    cmd_prefix = b"echo "
+    cmd_suffix = b" | base64 --decode | sh"
     TestRun.LOGGER.info(f"{value_name}: {cmd.param}")
     TestRun.LOGGER.info(f"Command: {cmd.command}")
-    output = TestRun.executor.run(cmd.command)
+
+    encoded_command = cmd_prefix + base64.b64encode(cmd.command) + cmd_suffix
+
+    TestRun.LOGGER.info(f"Executed (encoded) command: {encoded_command}")
+    output = TestRun.executor.run(encoded_command)
 
     if output.exit_code == 0 and not is_valid:
-        TestRun.LOGGER.error(f"{cmd.param} value is not valid\n"
-                             f"stdout: {output.stdout}\n"
-                             f"stderr: {output.stderr}")
+        TestRun.LOGGER.error(
+            f"{cmd.param} value is not valid\n"
+            f"stdout: {output.stdout}\n"
+            f"stderr: {output.stderr}"
+        )
     elif output.exit_code != 0 and is_valid:
-        TestRun.LOGGER.error(f"{cmd.param} value is valid but command returned with "
-                             f"{output.exit_code} exit code\n"
-                             f"stdout: {output.stdout}\n"
-                             f"stderr: {output.stderr}")
+        TestRun.LOGGER.error(
+            f"{cmd.param} value is valid but command returned with "
+            f"{output.exit_code} exit code\n"
+            f"stdout: {output.stdout}\n"
+            f"stderr: {output.stderr}"
+        )
 
     return output
 
 
 def get_cmd(command, param):
-    FuzzedCommand = namedtuple('Command', ['param', 'command'])
-
-    return FuzzedCommand(param, command)
+    FuzzedCommand = namedtuple("Command", ["param", "command"])
+    return FuzzedCommand(param, command.encode("ascii"))
diff --git a/test/functional/tests/security/fuzzy/kernel/fuzzy_with_io/common/common.py b/test/functional/tests/security/fuzzy/kernel/fuzzy_with_io/common/common.py
index 9432a67..91cb165 100644
--- a/test/functional/tests/security/fuzzy/kernel/fuzzy_with_io/common/common.py
+++ b/test/functional/tests/security/fuzzy/kernel/fuzzy_with_io/common/common.py
@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2022 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies
 # SPDX-License-Identifier: BSD-3-Clause
 #
 from datetime import timedelta
@@ -8,19 +9,23 @@ from test_tools.fio.fio import Fio
 from test_tools.fio.fio_param import IoEngine, ReadWrite
 from test_utils.size import Size, Unit
 
+mount_point = "/mnt/test"
+
 
 def get_basic_workload(mount_point: str):
     file_min_size = Size(10, Unit.Byte).get_value()
     file_max_size = Size(512, Unit.KiB).get_value()
-    fio = (Fio()
-           .create_command()
-           .io_engine(IoEngine.libaio)
-           .direct()
-           .run_time(timedelta(days=1))
-           .time_based()
-           .directory(mount_point)
-           .read_write(ReadWrite.randrw)
-           .nr_files(1000)
-           .file_size_range([(file_min_size, file_max_size)])
-           .num_jobs(32))
+    fio = (
+        Fio()
+        .create_command()
+        .io_engine(IoEngine.libaio)
+        .direct()
+        .run_time(timedelta(days=1))
+        .time_based()
+        .directory(mount_point)
+        .read_write(ReadWrite.randrw)
+        .nr_files(1000)
+        .file_size_range([(file_min_size, file_max_size)])
+        .num_jobs(32)
+    )
     return fio