Vulnerability Monitor

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CVE-2021-33500

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.

Published

2021-05-21T20:15:07.723

Last Modified

2024-11-21T06:08:57.423

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	putty	putty	< 0.75	Yes
Operating System	microsoft	windows	-	No

References

https://docs.ssh-mitm.at/puttydos.html Exploit, Third Party Advisory ([email protected])
https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py Exploit, Third Party Advisory ([email protected])
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Release Notes, Third Party Advisory ([email protected])
https://docs.ssh-mitm.at/puttydos.html Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)