mcs_recv_aucf(uint16 * mcs_userid)
{
	RD_BOOL is_fastpath;
	uint8 fastpath_hdr;
	uint8 opcode, result;
	STREAM s;

	logger(Protocol, Debug, "%s()", __func__);
	s = iso_recv(&is_fastpath, &fastpath_hdr);

	if (s == NULL)
		return False;

	in_uint8(s, opcode);
	if ((opcode >> 2) != MCS_AUCF)
	{
		logger(Protocol, Error, "mcs_recv_aucf(), expected opcode AUcf, got %d", opcode);
		return False;
	}

	in_uint8(s, result);
	if (result != 0)
	{
		logger(Protocol, Error, "mcs_recv_aucf(), expected result 0, got %d", result);
		return False;
	}

	if (opcode & 2)
		in_uint16_be(s, *mcs_userid);

	return s_check_end(s);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.