{"id":"CVE-2018-21035","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-21035","generatedAt":"2026-10-29T01:50:06.040Z","title":"This makes it easier for attackers to cause a denial of service (memory consumption).","description":"In Qt through 5.14.1, the WebSocket implementation accepts up to 2GB for frames and 2GB for messages. Smaller limits cannot be configured. This makes it easier for attackers to cause a denial of service (memory consumption).","published":"2020-02-28T21:15:13.000Z","lastModified":"2026-06-17T01:54:00.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770"],"affected":["qt/qt"],"epss":{"score":0.02339,"percentile":0.83518,"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":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://bugreports.qt.io/browse/QTBUG-70693","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://codereview.qt-project.org/c/qt/qtwebsockets/+/284735","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://bugreports.qt.io/browse/QTBUG-70693","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://codereview.qt-project.org/c/qt/qtwebsockets/+/284735","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-21035","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."}