QID 375629

Date Published: 2021-06-17

QID 375629: Putty Denial of Service Vulnerability

PuTTY is a client program for the SSH, Telnet and Rlogin network protocols. It is integrated in multiple applications on multiple operating systems for providing SSH, Telnet, and Rlogin protocol support.

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.

Affected Version:
PuTTY version prior to 0.75

QID Detection Logic
This QID checks the vulnerable version of PuTTY by checking the file version of file in registry and also checks in %programfiles%\PuTTY location.

Successful exploitation of this vulnerability may allow an attacker to crash the putty service on the target system.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Customers are advised to upgrade to latest version PuTTY 0.75 Inorder to remediate this vulnerability.
    Vendor References

    CVEs related to QID 375629

    CVE-2021-33500 |
    Software Advisories
    Advisory ID Software Component Link
    Putty URL Logo www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
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