diff --git a/src/com/android/settings/wifi/WifiDialogActivity.java b/src/com/android/settings/wifi/WifiDialogActivity.java
index 8a46c9d18c5..e3e77e86000 100644
--- a/src/com/android/settings/wifi/WifiDialogActivity.java
+++ b/src/com/android/settings/wifi/WifiDialogActivity.java
@@ -19,6 +19,7 @@ package com.android.settings.wifi;
 import static android.Manifest.permission.ACCESS_FINE_LOCATION;
 import static android.os.UserManager.DISALLOW_CONFIG_WIFI;
 
+import android.app.KeyguardManager;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -51,6 +52,7 @@ import com.android.wifitrackerlib.WifiEntry;
 import com.google.android.setupcompat.util.WizardManagerHelper;
 import com.google.android.setupdesign.util.ThemeHelper;
 
+import java.lang.ref.WeakReference;
 import java.time.Clock;
 import java.time.ZoneOffset;
 
@@ -96,10 +98,12 @@ public class WifiDialogActivity extends ObservableActivity implements WifiDialog
     // Interval between initiating NetworkDetailsTracker scans.
     private static final long SCAN_INTERVAL_MILLIS = 10_000;
 
-    private WifiDialog mDialog;
+    @VisibleForTesting
+    WifiDialog mDialog;
     private AccessPoint mAccessPoint;
 
-    private WifiDialog2 mDialog2;
+    @VisibleForTesting
+    WifiDialog2 mDialog2;
 
     // The received intent supports a key of WifiTrackerLib or SettingsLib.
     private boolean mIsWifiTrackerLib;
@@ -108,6 +112,7 @@ public class WifiDialogActivity extends ObservableActivity implements WifiDialog
     private NetworkDetailsTracker mNetworkDetailsTracker;
     private HandlerThread mWorkerThread;
     private WifiManager mWifiManager;
+    private LockScreenMonitor mLockScreenMonitor;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -184,6 +189,10 @@ public class WifiDialogActivity extends ObservableActivity implements WifiDialog
                 mDialog.setOnDismissListener(this);
             }
         }
+
+        if (mDialog2 != null || mDialog != null) {
+            mLockScreenMonitor = new LockScreenMonitor(this);
+        }
     }
 
     @VisibleForTesting
@@ -221,6 +230,10 @@ public class WifiDialogActivity extends ObservableActivity implements WifiDialog
             }
         }
 
+        if (mLockScreenMonitor != null) {
+            mLockScreenMonitor.release();
+            mLockScreenMonitor = null;
+        }
         super.onDestroy();
     }
 
@@ -411,4 +424,45 @@ public class WifiDialogActivity extends ObservableActivity implements WifiDialog
         }
         return false;
     }
+
+    void dismissDialog() {
+        if (mDialog != null) {
+            mDialog.dismiss();
+            mDialog = null;
+        }
+        if (mDialog2 != null) {
+            mDialog2.dismiss();
+            mDialog2 = null;
+        }
+    }
+
+    @VisibleForTesting
+    static final class LockScreenMonitor implements KeyguardManager.KeyguardLockedStateListener {
+        private final WeakReference<WifiDialogActivity> mWifiDialogActivity;
+        private KeyguardManager mKeyguardManager;
+
+        LockScreenMonitor(WifiDialogActivity activity) {
+            mWifiDialogActivity = new WeakReference<>(activity);
+            mKeyguardManager = activity.getSystemService(KeyguardManager.class);
+            mKeyguardManager.addKeyguardLockedStateListener(activity.getMainExecutor(), this);
+        }
+
+        void release() {
+            if (mKeyguardManager == null) return;
+            mKeyguardManager.removeKeyguardLockedStateListener(this);
+            mKeyguardManager = null;
+        }
+
+        @Override
+        public void onKeyguardLockedStateChanged(boolean isKeyguardLocked) {
+            if (!isKeyguardLocked) return;
+            WifiDialogActivity activity = mWifiDialogActivity.get();
+            if (activity == null) return;
+            activity.dismissDialog();
+
+            Log.e(TAG, "Dismiss Wi-Fi dialog to prevent leaking user data on lock screen!");
+            EventLog.writeEvent(0x534e4554, "231583603", -1 /* UID */,
+                    "Leak Wi-Fi dialog on lock screen");
+        }
+    }
 }
diff --git a/tests/robotests/src/com/android/settings/wifi/WifiDialogActivityTest.java b/tests/robotests/src/com/android/settings/wifi/WifiDialogActivityTest.java
index 28b7ecbf09b..c9cc02e9afb 100644
--- a/tests/robotests/src/com/android/settings/wifi/WifiDialogActivityTest.java
+++ b/tests/robotests/src/com/android/settings/wifi/WifiDialogActivityTest.java
@@ -33,6 +33,7 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import android.app.KeyguardManager;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.net.wifi.WifiConfiguration;
@@ -46,7 +47,6 @@ import com.android.wifitrackerlib.WifiEntry;
 import com.google.android.setupcompat.util.WizardManagerHelper;
 
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
@@ -82,6 +82,8 @@ public class WifiDialogActivityTest {
     Intent mResultData;
     @Mock
     WifiConfigController mController;
+    @Mock
+    KeyguardManager mKeyguardManager;
 
     WifiDialogActivity mActivity;
 
@@ -99,6 +101,7 @@ public class WifiDialogActivityTest {
         mActivity = spy(Robolectric.setupActivity(WifiDialogActivity.class));
         when(mActivity.getSystemService(UserManager.class)).thenReturn(mUserManager);
         when(mActivity.getSystemService(WifiManager.class)).thenReturn(mWifiManager);
+        when(mActivity.getSystemService(KeyguardManager.class)).thenReturn(mKeyguardManager);
     }
 
     @Test
@@ -294,4 +297,35 @@ public class WifiDialogActivityTest {
 
         assertThat(result).isTrue();
     }
+
+    @Test
+    public void dismissDialog_hasDialog_dialogDismiss() {
+        mActivity.mDialog = mWifiDialog;
+        mActivity.mDialog2 = mWifiDialog2;
+
+        mActivity.dismissDialog();
+
+        verify(mWifiDialog).dismiss();
+        verify(mWifiDialog2).dismiss();
+    }
+
+    @Test
+    public void onKeyguardLockedStateChanged_keyguardIsNotLocked_doNotDismissDialog() {
+        WifiDialogActivity.LockScreenMonitor lockScreenMonitor =
+                new WifiDialogActivity.LockScreenMonitor(mActivity);
+
+        lockScreenMonitor.onKeyguardLockedStateChanged(false /* isKeyguardLocked */);
+
+        verify(mActivity, never()).dismissDialog();
+    }
+
+    @Test
+    public void onKeyguardLockedStateChanged_keyguardIsLocked_dismissDialog() {
+        WifiDialogActivity.LockScreenMonitor lockScreenMonitor =
+                new WifiDialogActivity.LockScreenMonitor(mActivity);
+
+        lockScreenMonitor.onKeyguardLockedStateChanged(true /* isKeyguardLocked */);
+
+        verify(mActivity).dismissDialog();
+    }
 }