Unhandled exception at 0x00000000772CA267 (ntdll.dll) in *****.exe : 0xC0000005: Access violation writing location 0xFFFFFCA800000000

I am getting this exception

Unhandled exception at 0x00000000772CA267 (ntdll.dll) in ******.exe: 0xC0000005: Access violation writing location 0xFFFFFCA800000000.

When I look into callstack I don't see my code in the stack but the below:

ntdll.dll!RtlFreeHeap() Unknown
kernel32.dll!HeapFree() Unknown
winhttp.dll!CAuthData::Clear(void)  Unknown
winhttp.dll!HTTP_USER_REQUEST::_AdjustCredentialStates(unsigned short,int *)    Unknown
winhttp.dll!HTTP_USER_REQUEST::_ResponseProcessingLoop(class PENDING_API_CALL *)    Unknown
winhttp.dll!HTTP_USER_REQUEST::OnRecvResponse(unsigned long)    Unknown
winhttp.dll!WEBIO_REQUEST::OnIoComplete(unsigned long,unsigned __int64,class HTTP_ASYNC_OVERLAPPED *)   Unknown
winhttp.dll!HTTP_THREAD_POOL::_WorkItemCallback(void)   Unknown
ntdll.dll!TppWorkpExecuteCallback() Unknown
ntdll.dll!TppWorkerThread() Unknown
kernel32.dll!BaseThreadInitThunk()  Unknown
ntdll.dll!RtlUserThreadStart()  Unknown

We use SOAP req/res. But we have updated couple of req/res to REST not we use json req/res. After this change we get the above problem. Sometimes everything works fine You could say failure is 50% times.

Found the solution for this problem. Actually before this call there was bufferoverflow which was corrupting my heap. Fixing the bufferoverflow solved my problem.