You are a network security expert, please audit the code, and give the existing vulnerability level and repair suggestions.    
void bad()
{
    wchar_t * data;
    wchar_t dataBuffer[256] = L"";
    data = dataBuffer;
    {
#ifdef _WIN32
        WSADATA wsaData;
        int wsaDataInit = 0;
#endif
        int recvResult;
        struct sockaddr_in service;
        wchar_t *replace;
        SOCKET listenSocket = INVALID_SOCKET;
        SOCKET acceptSocket = INVALID_SOCKET;
        size_t dataLen = wcslen(data);
        do
        {
#ifdef _WIN32
            if (WSAStartup(MAKEWORD(2,2), &wsaData) != NO_ERROR)
            {
                break;
            }
            wsaDataInit = 1;
#endif
            /* POTENTIAL FLAW: Read data using a listen socket */
            listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
            if (listenSocket == INVALID_SOCKET)
            {
                break;
            }
            memset(&service, 0, sizeof(service));
            service.sin_family = AF_INET;
            service.sin_addr.s_addr = INADDR_ANY;
            service.sin_port = htons(TCP_PORT);
            if (bind(listenSocket, (struct sockaddr*)&service, sizeof(service)) == SOCKET_ERROR)
            {
                break;
            }
            if (listen(listenSocket, LISTEN_BACKLOG) == SOCKET_ERROR)
            {
                break;
            }
            acceptSocket = accept(listenSocket, NULL, NULL);
            if (acceptSocket == SOCKET_ERROR)
            {
                break;
            }
            /* Abort on error or the connection was closed */
            recvResult = recv(acceptSocket, (char *)(data + dataLen), sizeof(wchar_t) * (256 - dataLen - 1), 0);
            if (recvResult == SOCKET_ERROR || recvResult == 0)
            {
                break;
            }
            /* Append null terminator */
            data[dataLen + recvResult / sizeof(wchar_t)] = L'\0';
            /* Eliminate CRLF */
            replace = wcschr(data, L'\r');
            if (replace)
            {
                *replace = L'\0';
            }
            replace = wcschr(data, L'\n');
            if (replace)
            {
                *replace = L'\0';
            }
        }
        while (0);
        if (listenSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(listenSocket);
        }
        if (acceptSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(acceptSocket);
        }
#ifdef _WIN32
        if (wsaDataInit)
        {
            WSACleanup();
   