There is code in the release for attacks on Microsoft's Windows, Apple's iOS, macOS and OS x, Google's Android, Linux and Samsung TVs.
The hacking and malware tools are built by the Engineering Development Group, a department of the CIA's Directorate for Digital Innovation. This is one of the five major directorates of the CIA.
The exploit to listen in through Samsung TVs has been dubbed Weeping Angel and was developed with Britain's MI5/BTSS, WikiLeaks said.
The CIA named one of their hacking tools "McNugget". I think McDonald's should sue the CIA for infringement of their trademark. pic.twitter.com/Vkybc8BSGV— Mustafa Al-Bassam (@musalbas) 7 March 2017
The agency's Mobile Devices Branch had developed numerous attacks to remotely hack into and take over popular smartphones; the location of the owner, audio and text communications could be snooped on, while the phone's camera and microphone could be covertly activated.
The iPhone had 14.5% of the global smartphone market in 2016, but the CIA had a specialised unit to develop attack tools for this device, probably because it was popular among diplomatic, social, political and business elites, WikiLeaks said.
A similar unit was focused on Google's Android operating system which has nearly all of the remaining market share.
"Year Zero shows that as of 2016 the CIA had 24 'weaponized' Android 'zero days' which it has developed itself and obtained from GCHQ, NSA and cyber arms contractors.
"These techniques permit the CIA to bypass the encryption of WhatsApp, Signal, Telegram, Weibo, Confide and Cloackman by hacking the smartphones that they run on and collecting audio and message traffic before encryption is applied."
The material released shows a huge effort to control Windows users with malware, including numerous local and remote weaponised zero-day exploits, and air gap jumping viruses like Hammer Drill which is used to collect information from CDs/DVD.
There are also exploits for routers, infectors for removable media like flash drives, systems for steganography (hiding data in images) or in covert disk areas.
WikiLeaks said the CIA had built automated multi-platform malware attack and control systems for Windows, Linux, OS X, Solaris and other operating systems.
One of the tools described is HIVE; it contains customisable implants for Windows, Solaris,s MikroTik (routers), and Linux and a command and control infrastructure to communicate with the software after it is placed on targets.