{"id":"CVE-2017-20190","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-20190","generatedAt":"2026-10-28T20:57:56.300Z","title":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack.","description":"Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.","published":"2024-03-27T00:15:08.000Z","lastModified":"2026-06-17T01:15:22.000Z","status":"Deferred","sourceIdentifier":"cve@mitre.org","cvss":null,"cwe":["CWE-176"],"affected":[],"epss":{"score":0.00262,"percentile":0.17902,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"unknown","text":"Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published."},"changes":[],"references":[{"url":"https://aka.ms/windowsbugbar","source":"cve@mitre.org"},{"url":"https://en.wikipedia.org/wiki/Zalgo_text","source":"cve@mitre.org"},{"url":"https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234","source":"cve@mitre.org"},{"url":"https://aka.ms/windowsbugbar","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://en.wikipedia.org/wiki/Zalgo_text","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-20190","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}