diff --git a/nova/console/websocketproxy.py b/nova/console/websocketproxy.py
index e13b3c0fe153..87d755ec66fb 100644
--- a/nova/console/websocketproxy.py
+++ b/nova/console/websocketproxy.py
@@ -19,6 +19,7 @@ Leverages websockify.py by Joel Martin
 '''
 
 import copy
+import os
 import socket
 import sys
 
@@ -305,6 +306,27 @@ class NovaProxyRequestHandler(NovaProxyRequestHandlerBase,
             # Fall back to the websockify <= v0.8.0 'socket' method location.
             return websockify.WebSocketServer.socket(*args, **kwargs)
 
+    def send_head(self):
+        # This code is copied from this example patch:
+        # https://bugs.python.org/issue32084#msg306545
+        path = self.translate_path(self.path)
+        if os.path.isdir(path):
+            parts = urlparse.urlsplit(self.path)
+            if not parts.path.endswith('/'):
+                # redirect browser - doing basically what apache does
+                new_parts = (parts[0], parts[1], parts[2] + '/',
+                              parts[3], parts[4])
+                new_url = urlparse.urlunsplit(new_parts)
+
+                # Browsers interpret "Location: //uri" as an absolute URI
+                # like "http://URI"
+                if new_url.startswith('//'):
+                    self.send_error(400,
+                                    "URI must not start with //")
+                    return None
+
+        return super(NovaProxyRequestHandler, self).send_head()
+
 
 class NovaWebSocketProxy(websockify.WebSocketProxy):
     def __init__(self, *args, **kwargs):
diff --git a/nova/tests/unit/console/test_websocketproxy.py b/nova/tests/unit/console/test_websocketproxy.py
index 98e162d59cb6..45917c2f41c5 100644
--- a/nova/tests/unit/console/test_websocketproxy.py
+++ b/nova/tests/unit/console/test_websocketproxy.py
@@ -15,6 +15,7 @@
 """Tests for nova websocketproxy."""
 
 import copy
+import io
 import socket
 
 import mock
@@ -626,6 +627,38 @@ class NovaProxyRequestHandlerBaseTestCase(test.NoDBTestCase):
         self.wh.server.top_new_client(conn, address)
         self.assertIsNone(self.wh._compute_rpcapi)
 
+    def test_reject_open_redirect(self):
+        # This will test the behavior when an attempt is made to cause an open
+        # redirect. It should be rejected.
+        mock_req = mock.MagicMock()
+        mock_req.makefile().readline.side_effect = [
+            b'GET //example.com/%2F.. HTTP/1.1\r\n',
+            b''
+        ]
+
+        client_addr = ('8.8.8.8', 54321)
+        mock_server = mock.MagicMock()
+        # This specifies that the server will be able to handle requests other
+        # than only websockets.
+        mock_server.only_upgrade = False
+
+        # Constructing a handler will process the mock_req request passed in.
+        handler = websocketproxy.NovaProxyRequestHandler(
+            mock_req, client_addr, mock_server)
+
+        # Collect the response data to verify at the end. The
+        # SimpleHTTPRequestHandler writes the response data to a 'wfile'
+        # attribute.
+        output = io.BytesIO()
+        handler.wfile = output
+        # Process the mock_req again to do the capture.
+        handler.do_GET()
+        output.seek(0)
+        result = output.readlines()
+
+        # Verify no redirect happens and instead a 400 Bad Request is returned.
+        self.assertIn('400 URI must not start with //', result[0].decode())
+
 
 class NovaWebsocketSecurityProxyTestCase(test.NoDBTestCase):
 
diff --git a/releasenotes/notes/console-proxy-reject-open-redirect-4ac0a7895acca7eb.yaml b/releasenotes/notes/console-proxy-reject-open-redirect-4ac0a7895acca7eb.yaml
new file mode 100644
index 000000000000..ce05b9a8670c
--- /dev/null
+++ b/releasenotes/notes/console-proxy-reject-open-redirect-4ac0a7895acca7eb.yaml
@@ -0,0 +1,19 @@
+---
+security:
+  - |
+    A vulnerability in the console proxies (novnc, serial, spice) that allowed
+    open redirection has been `patched`_. The novnc, serial, and spice console
+    proxies are implemented as websockify servers and the request handler
+    inherits from the python standard SimpleHTTPRequestHandler. There is a
+    `known issue`_ in the SimpleHTTPRequestHandler which allows open redirects
+    by way of URLs in the following format::
+
+      http://vncproxy.my.domain.com//example.com/%2F..
+
+    which if visited, will redirect a user to example.com.
+
+    The novnc, serial, and spice console proxies will now reject requests that
+    pass a redirection URL beginning with "//" with a 400 Bad Request.
+
+    .. _patched: https://bugs.launchpad.net/nova/+bug/1927677
+    .. _known issue: https://bugs.python.org/issue32084