Home |FAQ |Feedback |Licence |Updates |Mirrors |Keys |Links |Team
Download:Stable ·Snapshot |Docs |Changes |Wishlist
- A telnet client is the hard- or software, that is used on the user side and which enables the user to interact with a server throgh the telnet protocol. Note: Since telnet is an unencrypted connection method, the telnet protocol has been superceded by the SSH protocol.
- ZOC is a telnet client and terminal emulator for Windows. Download this telnet and client and other communications software by Emtec - free trial versions are available.
PuTTY is a free implementation of SSH and Telnet for Windows and Unixplatforms, along with an xterm terminal emulator. It iswritten and maintained primarily bySimon Tatham.
The latest version is 0.76.Download it here.
LEGAL WARNING:Use of PuTTY, PSCP, PSFTP and Plink is illegal in countries whereencryption is outlawed. We believe it is legal to use PuTTY, PSCP,PSFTP and Plink in England and Wales and in many other countries, butwe are not lawyers, and so if in doubt you should seek legal advicebefore downloading it. You may find useful information atcryptolaw.org, which collectsinformation on cryptography laws in many countries, but wecan't vouch for its correctness.
Use of the Telnet-only binary (PuTTYtel) is unrestricted by anycryptography laws.
Latest news
Telnet is a client-server protocol predating the TCP protocol. The network protocol allows a user to log into another computer within the same network through a TCP/IP connection. A client machine running the Telnet client connects to a CLI on a remote device, most commonly a dedicated platform. Telnet operates on client/server principle. Local computer uses telnet client program and the remote computers uses telnet server program. TELNET Commands: Commands of the telnet are identified by a prefix character, Interpret As Command (IAC) which is having code 255. IAC is followed by command and option codes.
2021-07-17 PuTTY 0.76 released
PuTTY 0.76, released today, is a bug-fix and security release. Itfixes bugs in 0.75, and alsoadds anew configuration optionas an extra defence against authentication prompt spoofing by amalicious or compromised SSH server.
2021-06-13 Pre-releases of 0.76 now available
/telnet-priyanka-gupta-getty-images-5c5c996446e0fb0001849c48.png "Telnet Client")
We're working towards a 0.76 release. Pre-release builds are available, and we'd appreciate people testingthem and reporting any issues.
0.76 will be a pure bug-fix release, fixing a few high-impact bugsthat appeared as a result of all of 0.75's new features. Inparticular, 0.76 fixes the crash when you enable the 'Use systemcolours' setting on Windows PuTTY.
2021-05-28 Cloudflare public DNS blocking PuTTY downloads
If you use some of Cloudflare's public DNS resolvers (1.1.1.2 or1.1.1.3), you may find you can't download PuTTY at the moment.
The server that hosts the release files, the.earth.li, hasbeen blockedsince at least 22 May. We don't know why; Cloudflare's owncategorisationof the site does not currently include any 'security threat' tags.
If you're currently having trouble downloading PuTTY, check what DNSresolver you're using. If it's one of these, we suggest you use adifferent one.
2021-05-08 PuTTY 0.75 released
PuTTY 0.75, released today, provides major new features: deferred keydecryption in Pageant, more secure SSH key fingerprints and SSHprivate key files, and some new network protocols for specialpurposes.
0.75 also contains a fix for a DoS vulnerability in the Windowsterminal emulator, which allowed a malicious server to lock up all GUIWindows applications running on the client.
2021-04-18 Pre-releases of 0.75 now available
We're working towards a 0.75 release. Pre-release builds are available, and we'd appreciate people testingthem and reporting any issues.
0.75 will be a feature release. The biggest changes all relate toPageant and/or SSH public keys. User-visible behaviour changes include:
- Pageant now allows you to load a key without decrypting it, inwhich case it will wait until you first use it to ask for thepassphrase.
- We've switched to the modern OpenSSH-style SHA-256 style of keyfingerprint.
- We've added support for the
rsa-sha2-256andrsa-sha2-512signature methods, which some servers nowrequire in order to use RSA keys. - We've introduced a new version of the PPK format for private keyfiles, to remove weak crypto and improve password-guessingresistance.
- We've introduced a new method for applications to talk to Pageanton Windows, based on the same named-pipe system used by connectionsharing instead of window messages.
2020-11-22 Primary git branch renamed
The primary branch in the PuTTY git repository is now called main,instead of git's default of master. For now, both branch namescontinue to exist, and are kept automatically in sync by a symbolic-ref on theserver. In a few months' time, the alias master will be withdrawn.
To update a normal downstream clone or checkout to use the new branch name, youcan run commands such as ‘git branch -m master main’ followed by‘git branch -u origin/main main’.
2020-06-27 PuTTY 0.74 released
Telnet Client For Android
PuTTY 0.74, released today, is a bug-fix and security release. Itfixes bugs in 0.73, including one possible vulnerability, and alsoadds anew configuration optionto mitigate a minor information leak in SSH host key policy.
2019-09-29 PuTTY 0.73 released
PuTTY 0.73, released today, is a bug-fix release. It fixes a small number of bugs since 0.72, and a couple of them have potential security implications.
2019-07-20 PuTTY 0.72 released
PuTTY 0.72, released today, is a bug-fix release. It fixes a smallnumber of further security issues found by the 2019 EU-fundedHackerOne bug bounty, and a variety of other bugs introduced in 0.71.
Telnet Client For Mac
2019-07-08 Bug bounty concluded
The EU-funded bug bounty programme is now closed. Many thanks toeverybody who sent in reports!
Anyone with a vulnerability to report should now go back to reportingit in the old way, via email to the PuTTY team, as described on theFeedback page.If you think it needs to be reported confidentially, encrypt it withour Secure Contact Key.
2019-03-25 Bug bounty continues
This year's EU-funded bug bounty programme is stillrunning. It was originally scheduled to end on 7th March, butthere was money left over in the budget. So while that money lasts,you still have a chance to earn some by finding vulnerabilities inPuTTY 0.71 or the development snapshots!
As before, vulnerabilities should be reported through theHackerOne web sitein order to qualify for a bounty: if you send reports directly to thePuTTY team in the usual way, then we'll still fix them, but we can'tprovide money for them.
2019-03-16 PuTTY 0.71 released
PuTTY 0.71, released today, includes a large number of security fixes,many of which were found by the recent EU-funded HackerOne bug bounty.There are also other security enhancements (side-channel resistance),and a few new features.It's also the first release to be built for Windows on Arm.
2019-01-18 EU bug bounty for finding vulnerabilities in PuTTY
From now until 7th March, you can earn money by reporting securityvulnerabilities in PuTTY!
HackerOne is running a bugbounty programme for PuTTY, funded by the European Union as partof the ‘Free and Open Source Software Audit’ project(EU-FOSSA 2). If you report a vulnerability through their web site, itmay qualify for a bounty. (The exact amount will depend on how seriousthe problem is, and there's also a bonus for providing a patch thatfixes it.)
For more details, or if you have something to report, see the linkabove.
(Please note that HackerOne will only consider vulnerabilitiesreported to them. If you send a report directly to the PuTTYteam in the usual way, then of course we'll still fix it, but we can'talso arrange for you to get paid.)
2018-08-25 GPG key rollover
This week we've generated a fresh set of GPG keys for signing PuTTYrelease and snapshot builds. We will begin signing snapshots with thenew snapshot key, and future releases with the new release key. Thenew master key is signed with the old master keys, of course. Seethe keys page for more information.
2017-07-08 PuTTY 0.70 released, containing security and bug fixes
PuTTY 0.70, released today, fixes further problems with Windows DLLhijacking, and also fixes a small number of bugs in 0.69, includingbroken printing support and Unicode keyboard input on Windows.
Site map
- Licence conditions under which you mayuse PuTTY.
- The FAQ.
- The documentation.
- Download PuTTY:
- latest release 0.76
- Subscribe to the PuTTY-announcemailing list to be notified of new releases.
- Feedback and bug reporting: contactaddress and guidelines. Please read the guidelines beforesending us mail; we get a very large amount of mail and it will helpus answer you more quickly.
- Changes in recent releases.
- Wish list and list of known bugs.
- Links to related software andspecifications elsewhere.
- A page about the PuTTY team members.
(last modified on Sat Jul 17 11:52:57 2021)