CVEvulnerability
CVE-2021-33500
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-05-21
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Description
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.
Affected configurations
• putty putty (< 0.75)
References
- https://docs.ssh-mitm.at/puttydos.html Exploit, Third Party Advisory
- https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py Exploit, Third Party Advisory
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Release Notes, Third Party Advisory
- https://docs.ssh-mitm.at/puttydos.html Exploit, Third Party Advisory
- https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py Exploit, Third Party Advisory
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Release Notes, Third Party Advisory