Denial of Service Vulnerability in PuTTY for Windows
CVE-2021-33500

7.5HIGH

Key Information:

Vendor

Putty

Status
Putty
Vendor
CVE Published:
21 May 2021

What is CVE-2021-33500?

A denial of service vulnerability in PuTTY for Windows allows remote servers to manipulate the PuTTY window by rapidly changing its title. This results in a significant slowdown or freeze of the application's GUI due to excessive SetWindowTextA or SetWindowTextW calls. The attack can cause a disruptive experience for users, as the application becomes unresponsive. Furthermore, similar methodologies may potentially impact OS-level GUIs on Linux or other operating systems due to the underlying architecture.

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References

https://www.chiark.greenend.org.uk/~sgtatham/putty/change...
x_refsource_MISC
https://docs.ssh-mitm.at/puttydos.html
x_refsource_MISC
https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ss...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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