High severity7.5NVD Advisory· Published May 21, 2021· Updated Jun 17, 2026
CVE-2021-33500
CVE-2021-33500
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.
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Affected products
3Patches
Vulnerability mechanics
References
3- docs.ssh-mitm.at/puttydos.htmlnvdExploitThird Party Advisory
- github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.pynvdExploitThird Party Advisory
- www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlnvdRelease NotesThird Party Advisory
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