diff --git a/sdk/storage/azure-storage-blob/azure/storage/blob/_shared/base_client.py b/sdk/storage/azure-storage-blob/azure/storage/blob/_shared/base_client.py
index 9ad754b92b14..7ae31d69679c 100644
--- a/sdk/storage/azure-storage-blob/azure/storage/blob/_shared/base_client.py
+++ b/sdk/storage/azure-storage-blob/azure/storage/blob/_shared/base_client.py
@@ -317,9 +317,10 @@ def format_shared_key_credential(account, credential):
 
 def parse_connection_str(conn_str, credential, service):
     conn_str = conn_str.rstrip(";")
-    conn_settings = dict( # pylint: disable=consider-using-dict-comprehension
-        [s.split("=", 1) for s in conn_str.split(";")]
-    )
+    conn_settings = [s.split("=", 1) for s in conn_str.split(";")]
+    if  any(len(tup) != 2 for tup in conn_settings):
+        raise ValueError("Connection string is either blank or malformed.")
+    conn_settings = dict(conn_settings)
     endpoints = _SERVICE_PARAMS[service]
     primary = None
     secondary = None
diff --git a/sdk/storage/azure-storage-blob/tests/test_blob_client.py b/sdk/storage/azure-storage-blob/tests/test_blob_client.py
index 9c1393206320..18a4dcd38bf1 100644
--- a/sdk/storage/azure-storage-blob/tests/test_blob_client.py
+++ b/sdk/storage/azure-storage-blob/tests/test_blob_client.py
@@ -559,5 +559,20 @@ def callback(response):
         custom_headers = {'User-Agent': 'customer_user_agent'}
         service.get_service_properties(raw_response_hook=callback, headers=custom_headers)
 
+    def test_error_with_malformed_conn_str(self):
+        # Arrange
+        for conn_str in ["", "foobar", "foo;bar;baz", ";", "foobar=baz=foo" , "foo=;bar=;", "=", "=;=="]:
+            for service_type in SERVICES.items():
+                # Act
+                with self.assertRaises(ValueError) as e:
+                    service = service_type[0].from_connection_string(conn_str, blob_name="test", container_name="foo/bar")
+                
+                if conn_str in("", "foobar", "foo;bar;baz", ";"):
+                    self.assertEqual(
+                        str(e.exception), "Connection string is either blank or malformed.")
+                elif conn_str in ("foobar=baz=foo" , "foo=;bar=;", "=", "=;=="):
+                    self.assertEqual(
+                        str(e.exception), "Connection string missing required connection details.")
+
 
 # ------------------------------------------------------------------------------
diff --git a/sdk/storage/azure-storage-file-share/azure/storage/fileshare/_shared/base_client.py b/sdk/storage/azure-storage-file-share/azure/storage/fileshare/_shared/base_client.py
index 9ad754b92b14..7ae31d69679c 100644
--- a/sdk/storage/azure-storage-file-share/azure/storage/fileshare/_shared/base_client.py
+++ b/sdk/storage/azure-storage-file-share/azure/storage/fileshare/_shared/base_client.py
@@ -317,9 +317,10 @@ def format_shared_key_credential(account, credential):
 
 def parse_connection_str(conn_str, credential, service):
     conn_str = conn_str.rstrip(";")
-    conn_settings = dict( # pylint: disable=consider-using-dict-comprehension
-        [s.split("=", 1) for s in conn_str.split(";")]
-    )
+    conn_settings = [s.split("=", 1) for s in conn_str.split(";")]
+    if  any(len(tup) != 2 for tup in conn_settings):
+        raise ValueError("Connection string is either blank or malformed.")
+    conn_settings = dict(conn_settings)
     endpoints = _SERVICE_PARAMS[service]
     primary = None
     secondary = None
diff --git a/sdk/storage/azure-storage-file-share/tests/test_file_client.py b/sdk/storage/azure-storage-file-share/tests/test_file_client.py
index 2a0cf4e43db7..b2139249a434 100644
--- a/sdk/storage/azure-storage-file-share/tests/test_file_client.py
+++ b/sdk/storage/azure-storage-file-share/tests/test_file_client.py
@@ -401,6 +401,21 @@ def callback(response):
         custom_headers = {'User-Agent': 'customer_user_agent'}
         service.get_service_properties(raw_response_hook=callback, headers=custom_headers)
 
+    def test_error_with_malformed_conn_str(self):
+        # Arrange
+
+        for conn_str in ["", "foobar", "foobar=baz=foo", "foo;bar;baz", "foo=;bar=;", "=", ";", "=;=="]:
+            for service_type in SERVICES.items():
+                # Act
+                with self.assertRaises(ValueError) as e:
+                    service = service_type[0].from_connection_string(conn_str, share_name="test", directory_path="foo/bar", file_path="temp/dat")
+                
+                if conn_str in("", "foobar", "foo;bar;baz", ";"):
+                    self.assertEqual(
+                        str(e.exception), "Connection string is either blank or malformed.")
+                elif conn_str in ("foobar=baz=foo" , "foo=;bar=;", "=", "=;=="):
+                    self.assertEqual(
+                        str(e.exception), "Connection string missing required connection details.")
 
 # ------------------------------------------------------------------------------
 if __name__ == '__main__':
diff --git a/sdk/storage/azure-storage-queue/azure/storage/queue/_shared/base_client.py b/sdk/storage/azure-storage-queue/azure/storage/queue/_shared/base_client.py
index 9ad754b92b14..7ae31d69679c 100644
--- a/sdk/storage/azure-storage-queue/azure/storage/queue/_shared/base_client.py
+++ b/sdk/storage/azure-storage-queue/azure/storage/queue/_shared/base_client.py
@@ -317,9 +317,10 @@ def format_shared_key_credential(account, credential):
 
 def parse_connection_str(conn_str, credential, service):
     conn_str = conn_str.rstrip(";")
-    conn_settings = dict( # pylint: disable=consider-using-dict-comprehension
-        [s.split("=", 1) for s in conn_str.split(";")]
-    )
+    conn_settings = [s.split("=", 1) for s in conn_str.split(";")]
+    if  any(len(tup) != 2 for tup in conn_settings):
+        raise ValueError("Connection string is either blank or malformed.")
+    conn_settings = dict(conn_settings)
     endpoints = _SERVICE_PARAMS[service]
     primary = None
     secondary = None
diff --git a/sdk/storage/azure-storage-queue/tests/test_queue_client.py b/sdk/storage/azure-storage-queue/tests/test_queue_client.py
index 47c36d7e2339..e4b21e8120c4 100644
--- a/sdk/storage/azure-storage-queue/tests/test_queue_client.py
+++ b/sdk/storage/azure-storage-queue/tests/test_queue_client.py
@@ -458,6 +458,23 @@ def test_create_queue_client_with_complete_queue_url(self, resource_group, locat
             # Assert
         self.assertEqual(service.scheme, 'https')
         self.assertEqual(service.queue_name, 'bar')
+
+    def test_error_with_malformed_conn_str(self):
+        # Arrange
+
+        for conn_str in ["", "foobar", "foobar=baz=foo", "foo;bar;baz", "foo=;bar=;", "=", ";", "=;=="]:
+            for service_type in SERVICES.items():
+                # Act
+                with self.assertRaises(ValueError) as e:
+                    service = service_type[0].from_connection_string(conn_str, queue_name="test")
+                
+                if conn_str in("", "foobar", "foo;bar;baz", ";"):
+                    self.assertEqual(
+                        str(e.exception), "Connection string is either blank or malformed.")
+                elif conn_str in ("foobar=baz=foo" , "foo=;bar=;", "=", "=;=="):
+                    self.assertEqual(
+                        str(e.exception), "Connection string missing required connection details.")
+
 # ------------------------------------------------------------------------------
 if __name__ == '__main__':
     unittest.main()