def unparse_cpe23(parsed):
    """
    Join back the components into a CPE 2.3 name.

    :param parsed: Components parsed by parse_cpe().
    :type parsed: list(str)

    :returns: CPE 2.3 name.
    :rtype: str
    """
    return "cpe:2.3:" + ":".join(x.replace(":", r"\:") for x in parsed)