diff --git a/components/wifi/esp8266-driver/ESP8266Interface.cpp b/components/wifi/esp8266-driver/ESP8266Interface.cpp
index 2b44dcd826..ff8e790688 100644
--- a/components/wifi/esp8266-driver/ESP8266Interface.cpp
+++ b/components/wifi/esp8266-driver/ESP8266Interface.cpp
@@ -67,11 +67,13 @@ ESP8266Interface::ESP8266Interface()
       _if_connected(_cmutex),
       _initialized(false),
       _connect_retval(NSAPI_ERROR_OK),
+      _disconnect_retval(NSAPI_ERROR_OK),
       _conn_stat(NSAPI_STATUS_DISCONNECTED),
       _conn_stat_cb(NULL),
       _global_event_queue(mbed_event_queue()), // Needs to be set before attaching event() to SIGIO
       _oob_event_id(0),
       _connect_event_id(0),
+      _disconnect_event_id(0),
       _software_conn_stat(IFACE_STATUS_DISCONNECTED)
 {
     memset(_cbs, 0, sizeof(_cbs));
@@ -105,11 +107,14 @@ ESP8266Interface::ESP8266Interface(PinName tx, PinName rx, bool debug, PinName r
       _if_connected(_cmutex),
       _initialized(false),
       _connect_retval(NSAPI_ERROR_OK),
+      _disconnect_retval(NSAPI_ERROR_OK),
       _conn_stat(NSAPI_STATUS_DISCONNECTED),
       _conn_stat_cb(NULL),
       _global_event_queue(mbed_event_queue()), // Needs to be set before attaching event() to SIGIO
       _oob_event_id(0),
-      _connect_event_id(0)
+      _connect_event_id(0),
+      _disconnect_event_id(0),
+      _software_conn_stat(IFACE_STATUS_DISCONNECTED)
 {
     memset(_cbs, 0, sizeof(_cbs));
     memset(ap_ssid, 0, sizeof(ap_ssid));
diff --git a/features/nfc/source/nfc/NFCEEPROM.cpp b/features/nfc/source/nfc/NFCEEPROM.cpp
index 01f2715a85..1872376817 100644
--- a/features/nfc/source/nfc/NFCEEPROM.cpp
+++ b/features/nfc/source/nfc/NFCEEPROM.cpp
@@ -21,7 +21,8 @@ using namespace mbed;
 using namespace mbed::nfc;
 
 NFCEEPROM::NFCEEPROM(NFCEEPROMDriver *driver, events::EventQueue *queue, const Span<uint8_t> &ndef_buffer) : NFCTarget(ndef_buffer),
-    _delegate(NULL), _driver(driver), _event_queue(queue), _initialized(false), _current_op(nfc_eeprom_idle), _ndef_buffer_read_sz(0), _eeprom_address(0), _operation_result(NFC_ERR_UNKNOWN)
+    _delegate(NULL), _driver(driver), _event_queue(queue), _initialized(false), _current_op(nfc_eeprom_idle), _ndef_buffer_read_sz(0), _eeprom_address(0),
+    _operation_result(NFC_ERR_UNKNOWN), _ndef_buffer_reader{nullptr, 0, nullptr}
 {
     _driver->set_delegate(this);
     _driver->set_event_queue(queue);
diff --git a/features/nfc/source/nfc/ndef/common/Text.cpp b/features/nfc/source/nfc/ndef/common/Text.cpp
index b4d18e173b..6ea37be143 100644
--- a/features/nfc/source/nfc/ndef/common/Text.cpp
+++ b/features/nfc/source/nfc/ndef/common/Text.cpp
@@ -41,7 +41,9 @@ Text::Text(const Text &other) :
     _text_record(other._text_record ? new uint8_t[other._text_record_size] : NULL),
     _text_record_size(other._text_record_size)
 {
-    memcpy(_text_record, other._text_record, _text_record_size);
+    if (_text_record) {
+        memcpy(_text_record, other._text_record, _text_record_size);
+    }
 }
 
 Text::Text(
diff --git a/features/nfc/source/nfc/ndef/common/URI.cpp b/features/nfc/source/nfc/ndef/common/URI.cpp
index a392868843..4761251ce1 100644
--- a/features/nfc/source/nfc/ndef/common/URI.cpp
+++ b/features/nfc/source/nfc/ndef/common/URI.cpp
@@ -40,15 +40,19 @@ URI::URI(uri_identifier_code_t id, const Span<const uint8_t> &uri_field) :
     _uri(uri_field.size() ? new uint8_t[uri_id_code_size + uri_field.size()] : NULL),
     _uri_size(uri_id_code_size + uri_field.size())
 {
-    _uri[uri_id_index] = id;
-    memcpy(_uri + uri_field_index, uri_field.data(), uri_field.size());
+    if (_uri) {
+        _uri[uri_id_index] = id;
+        memcpy(_uri + uri_field_index, uri_field.data(), uri_field.size());
+    }
 }
 
 URI::URI(const URI &other) :
     _uri(other._uri ? new uint8_t[other._uri_size] : NULL),
     _uri_size(other._uri_size)
 {
-    memcpy(_uri, other._uri, other._uri_size);
+    if (_uri) {
+        memcpy(_uri, other._uri, other._uri_size);
+    }
 }
 
 URI::~URI()