CVE-2021-33500

Published: May 21, 2021Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: NVD

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 (1)

Products: Putty: Putty

1 product

Configuration A

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Putty Putty	Before 0.75

Running on/with	Platform Versions
Microsoft Windows	All versions

References (6)

https://docs.ssh-mitm.at/puttydos.html

Source: cve@mitre.org

ExploitThird Party Advisory

https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py

Source: cve@mitre.org

ExploitThird Party Advisory

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html

Source: cve@mitre.org

Release NotesThird Party Advisory

https://docs.ssh-mitm.at/puttydos.html

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html

Source: af854a3a-2127-422b-91ae-364da2661108

Release NotesThird Party Advisory

Timeline

No history available yet.