PuTTY: a free SSH and Telnet client

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PuTTY is a free implementation of SSH and Telnet for Windows and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham.

The latest version is beta 0.66.

LEGAL WARNING: Use of PuTTY, PSCP, PSFTP and Plink is illegal in countries where encryption is outlawed. We believe it is legal to use PuTTY, PSCP, PSFTP and Plink in England and Wales and in many other countries, but we are not lawyers, and so if in doubt you should seek legal advice before downloading it. You may find useful information at cryptolaw.org, which collects information on cryptography laws in many countries, but we can't vouch for its correctness.

Use of the Telnet-only binary (PuTTYtel) is unrestricted by any cryptography laws.

Latest news

2015-11-07 PuTTY 0.66 released, fixing a SECURITY HOLE

PuTTY 0.66, released today, fixes a security hole in 0.65 and before: vuln-ech-overflow. It also contains a few other small bug fixes and minor features.

2015-09-02 GPG key rollover

This week we've generated a fresh set of GPG keys for signing PuTTY release and snapshot builds. We will begin signing snapshots with the new snapshot key, and future releases with the new release key. The new master key is signed with the old master keys, of course. See the keys page for more information.

2015-07-25 PuTTY 0.65 released, containing bug fixes

PuTTY 0.65, released today, fixes the Vista bug where the configuration dialog became invisible, and a few other bugs, large and small.

2015-06-21 Pre-releases of 0.65 now available

We're working towards a 0.65 release. This will be a bug-fix release: it will not contain the various new cryptographic features in the development snapshots, but it will contain large and small bug fixes over 0.64, including in particular a fix for the recent Vista-specific bug in which the configuration dialog becomes invisible. We'd appreciate testing of the pre-release builds, which are available from the Download page as usual.

2015-05-19 Malware pretending to be PuTTY

A Symantec blog post warns that a trojaned copy of PuTTY has been detected in the wild. Fortunately, it's easily recognisable by its version identification ("Unidentified build, Nov 29 2013 21:41:02"). If you've encountered this version, we suggest you treat any machine that's run the malicious version as potentially compromised, change any passwords that might have been stolen, and resecure the accounts they protect.

2015-04-19 PuTTY detected as malware

We've had several reports recently of anti-virus software reporting PuTTY as malware (under a wide variety of names, often generic). This affects the latest release (0.64) and also the development snapshots (particularly puttygen.exe).

We believe these are false positives. In those cases where we've been able to contact the vendor (McAfee, Symantec, ClamAV), they have removed the detection.

However, most vendors' false-positive response is to whitelist specific binaries. While this will resolve detections of the 0.64 release, expect detections to recur with the development snapshots, which are built daily.

We've had no success requesting AV software vendors to perform more in-depth analysis. If this is causing trouble for you, and you have a support contract with your AV vendor, please query the detection with them directly.

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(last modified on Sat Nov 14 00:33:29 2015)