diff --git a/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo.c b/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo.c
index b425af17c2..f69a3e7748 100644
--- a/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo.c
+++ b/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo.c
@@ -201,7 +201,7 @@ GetDriverNameString (
       //
       // Method 2: Get the name string from FFS UI section
       //
-      StrCpyS (mNameString, PROFILE_NAME_STRING_LENGTH + 1, NameString);
+      StrnCpyS (mNameString, PROFILE_NAME_STRING_LENGTH + 1, NameString, PROFILE_NAME_STRING_LENGTH);
       mNameString[PROFILE_NAME_STRING_LENGTH] = 0;
       FreePool (NameString);
       return;
diff --git a/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c b/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c
index 4eb47d1386..0b5a717caa 100644
--- a/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c
+++ b/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.c
@@ -190,10 +190,10 @@ StartPerformanceMeasurementEx (
   LogEntryArray[Index].Handle = (EFI_PHYSICAL_ADDRESS) (UINTN) Handle;
 
   if (Token != NULL) {
-    AsciiStrCpyS (LogEntryArray[Index].Token, PEI_PERFORMANCE_STRING_SIZE, Token);
+    AsciiStrnCpyS (LogEntryArray[Index].Token, PEI_PERFORMANCE_STRING_SIZE, Token, PEI_PERFORMANCE_STRING_LENGTH);
   }
   if (Module != NULL) {
-    AsciiStrCpyS (LogEntryArray[Index].Module, PEI_PERFORMANCE_STRING_SIZE, Module);
+    AsciiStrnCpyS (LogEntryArray[Index].Module, PEI_PERFORMANCE_STRING_SIZE, Module, PEI_PERFORMANCE_STRING_LENGTH);
   }
 
   LogEntryArray[Index].EndTimeStamp = 0;
diff --git a/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c b/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c
index 485f713864..f28b657c94 100644
--- a/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c
+++ b/MdeModulePkg/Library/SmmCorePerformanceLib/SmmCorePerformanceLib.c
@@ -203,10 +203,10 @@ StartGaugeEx (
   GaugeEntryExArray[Index].Handle = (EFI_PHYSICAL_ADDRESS) (UINTN) Handle;
 
   if (Token != NULL) {
-    AsciiStrCpyS (GaugeEntryExArray[Index].Token, SMM_PERFORMANCE_STRING_SIZE, Token);
+    AsciiStrnCpyS (GaugeEntryExArray[Index].Token, SMM_PERFORMANCE_STRING_SIZE, Token, SMM_PERFORMANCE_STRING_LENGTH);
   }
   if (Module != NULL) {
-    AsciiStrCpyS (GaugeEntryExArray[Index].Module, SMM_PERFORMANCE_STRING_SIZE, Module);
+    AsciiStrnCpyS (GaugeEntryExArray[Index].Module, SMM_PERFORMANCE_STRING_SIZE, Module, SMM_PERFORMANCE_STRING_LENGTH);
   }
 
   GaugeEntryExArray[Index].EndTimeStamp = 0;