Description
PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming connection.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | putty | No fix yet | — |
| Ubuntu 26.04 LTS | putty | No fix yet | — |
| Ubuntu 25.10 | putty | No fix yet | — |
| Ubuntu 24.04 LTS | putty | No fix yet | — |
| Ubuntu 22.04 LTS | putty | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | putty | No fix yet | — |
| Ubuntu 18.04 LTS | putty | No fix yet | — |
| Ubuntu 16.04 LTS | putty | No fix yet | — |
Advisories 1
- WID-SEC-2024-0976 PuTTY: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 25, 2024