CVE-2021-33500

PuTTY: PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by…

CVE-2021-33500 is fixed in PuTTY on 1 platform by PuTTY 0.75.0.0 (version 0.75.0.0), released May 8, 2021. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.5
No vendor severity
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0191
79th percentile

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.

Where it's fixed

ProductFixed inFixReleased
Windows apps
PuTTY 0.75.0.0 PuTTY 0.75.0.0 May 8, 2021

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