  requestFailure() {
    const p = this._packetRW.write.allocStart;
    const packet = this._packetRW.write.alloc(1);

    packet[p] = MESSAGE.REQUEST_FAILURE;

    this._debug && this._debug('Outbound: Sending REQUEST_FAILURE');
    sendPacket(this, this._packetRW.write.finalize(packet));
  }
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.