diff --git a/homeassistant/components/upnp/config_flow.py b/homeassistant/components/upnp/config_flow.py
index 8afd3465f07..a85e47c5919 100644
--- a/homeassistant/components/upnp/config_flow.py
+++ b/homeassistant/components/upnp/config_flow.py
@@ -134,6 +134,14 @@ class UpnpFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         """
         _LOGGER.debug("async_step_ssdp: discovery_info: %s", discovery_info)
 
+        # Ensure complete discovery.
+        if (
+            ssdp.ATTR_UPNP_UDN not in discovery_info
+            or ssdp.ATTR_SSDP_ST not in discovery_info
+        ):
+            _LOGGER.debug("Incomplete discovery, ignoring")
+            return self.async_abort(reason="incomplete_discovery")
+
         # Ensure not already configuring/configured.
         udn = discovery_info[ssdp.ATTR_UPNP_UDN]
         st = discovery_info[ssdp.ATTR_SSDP_ST]  # pylint: disable=invalid-name
@@ -218,6 +226,7 @@ class UpnpOptionsFlowHandler(config_entries.OptionsFlow):
                 CONFIG_ENTRY_SCAN_INTERVAL, DEFAULT_SCAN_INTERVAL
             )
             update_interval = timedelta(seconds=update_interval_sec)
+            _LOGGER.debug("Updating coordinator, update_interval: %s", update_interval)
             coordinator.update_interval = update_interval
             return self.async_create_entry(title="", data=user_input)
 
diff --git a/homeassistant/components/upnp/strings.json b/homeassistant/components/upnp/strings.json
index 8936d2ec791..99e58698f2e 100644
--- a/homeassistant/components/upnp/strings.json
+++ b/homeassistant/components/upnp/strings.json
@@ -17,7 +17,8 @@
     "abort": {
       "already_configured": "UPnP/IGD is already configured",
       "no_devices_discovered": "No UPnP/IGDs discovered",
-      "no_devices_found": "No UPnP/IGD devices found on the network."
+      "no_devices_found": "No UPnP/IGD devices found on the network.",
+      "incomplete_discovery": "Incomplete discovery"
     }
   }
 }
diff --git a/tests/components/upnp/test_config_flow.py b/tests/components/upnp/test_config_flow.py
index c0f5b6b4ff2..870aa13fc41 100644
--- a/tests/components/upnp/test_config_flow.py
+++ b/tests/components/upnp/test_config_flow.py
@@ -65,6 +65,34 @@ async def test_flow_ssdp_discovery(hass: HomeAssistantType):
         }
 
 
+async def test_flow_ssdp_discovery_incomplete(hass: HomeAssistantType):
+    """Test config flow: incomplete discovery through ssdp."""
+    udn = "uuid:device_1"
+    mock_device = MockDevice(udn)
+    discovery_infos = [
+        {
+            DISCOVERY_ST: mock_device.device_type,
+            DISCOVERY_UDN: mock_device.udn,
+            DISCOVERY_LOCATION: "dummy",
+        }
+    ]
+    with patch.object(
+        Device, "async_create_device", AsyncMock(return_value=mock_device)
+    ), patch.object(Device, "async_discover", AsyncMock(return_value=discovery_infos)):
+        # Discovered via step ssdp.
+        result = await hass.config_entries.flow.async_init(
+            DOMAIN,
+            context={"source": config_entries.SOURCE_SSDP},
+            data={
+                ssdp.ATTR_SSDP_ST: mock_device.device_type,
+                # ssdp.ATTR_UPNP_UDN: mock_device.udn,  # Not provided.
+                "friendlyName": mock_device.name,
+            },
+        )
+        assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT
+        assert result["reason"] == "incomplete_discovery"
+
+
 async def test_flow_user(hass: HomeAssistantType):
     """Test config flow: discovered + configured through user."""
     udn = "uuid:device_1"