If software is procured from an unreliable source, there is no guarantee that it will be an unmodified original version of the software. Instead, a defective or compromised version of the software may have been obtained. This also applies to extensions such as plug-ins or add-ons. The installation of compromised software can lead to the distribution of malware within an organisation. There is also the possibility that the software will not function as intended. Moreover, the integrity and availability of IT systems can be impaired.