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Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
Use Putty vendor hub and Putty product page to widen CVE-2019-9897 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-17067, CVE-2019-9898 and CVE-2021-36367 for nearby disclosures in the same product family.