#vulnerable code 
                                @Override
    public Future<BasicNIOPoolEntry> lease(
            final HttpHost route,
            final Object state) {
        int connectTimeout = Config.getInt(params, CoreConnectionPNames.CONNECTION_TIMEOUT, 0);
        return super.lease(route, state, connectTimeout, TimeUnit.MILLISECONDS, null);
    } 
                            #location 5 
                            #vulnerability type INTERFACE_NOT_THREAD_SAFE
#fixed code
                                @Override
    public Future<BasicNIOPoolEntry> lease(
            final HttpHost route,
            final Object state) {
        return super.lease(route, state, this.connectTimeout, this.tunit, null);
    }