ofputil_encode_hello(uint32_t allowed_versions)
{
    enum ofp_version ofp_version;
    struct ofpbuf *msg;

    ofp_version = leftmost_1bit_idx(allowed_versions);
    msg = ofpraw_alloc(OFPRAW_OFPT_HELLO, ofp_version, 0);

    if (should_send_version_bitmap(allowed_versions)) {
        struct ofp_hello_elem_header *oheh;
        uint16_t map_len;

        map_len = sizeof allowed_versions;
        oheh = ofpbuf_put_zeros(msg, ROUND_UP(map_len + sizeof *oheh, 8));
        oheh->type = htons(OFPHET_VERSIONBITMAP);
        oheh->length = htons(map_len + sizeof *oheh);
        *ALIGNED_CAST(ovs_be32 *, oheh + 1) = htonl(allowed_versions);

        ofpmsg_update_length(msg);
    }

    return msg;
}

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.