CVE-2021-33500
No fix known EPSS 2%CVSS 7.5
PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling the PuTTY window to change its title repeatedly at high speed, which results in many SetWindowTextA or SetWindowTextW calls. NOTE: the same attack methodology may affect some OS-level GUIs on Linux or other platforms for similar reasons.
Products: putty
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu 16.04 LTS | putty | no fix |
| Ubuntu 18.04 LTS | putty | no fix |
| Ubuntu 20.04 LTS | putty | no fix |
| Ubuntu 22.04 LTS | putty | no fix |
| Ubuntu 24.04 LTS | putty | no fix |
| Ubuntu 25.10 | putty | no fix |
| Ubuntu 26.04 LTS | putty | no fix |
| Ubuntu 26.10 | putty | no fix |