diff --git a/firmware_handler.cpp b/firmware_handler.cpp
index 59ef651..4717e95 100644
--- a/firmware_handler.cpp
+++ b/firmware_handler.cpp
@@ -147,7 +147,11 @@
         return false;
     }
 
-    /* TODO: Is the verification process underway? */
+    /* Is the verification process underway? */
+    if (state == UpdateState::verificationStarted)
+    {
+        return false;
+    }
 
     /* Is there an open session already? We only allow one at a time.
      * TODO: Temporarily using a simple boolean flag until there's a full
@@ -279,6 +283,12 @@
         return false;
     }
 
+    /* Prevent writing during verification. */
+    if (state == UpdateState::verificationStarted)
+    {
+        return false;
+    }
+
     std::vector<std::uint8_t> bytes;
 
     if (item->second->flags & FirmwareUpdateFlags::ipmi)