{"id":"CVE-2021-33839","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-33839","generatedAt":"2026-10-27T20:19:53.720Z","title":"Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID-19 tracking because the QR code of a Public Location can be intentionally confused with the QR code of a Private Meeting.","description":"Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID-19 tracking because the QR code of a Public Location can be intentionally confused with the QR code of a Private Meeting.","published":"2021-06-04T00:15:07.000Z","lastModified":"2026-06-17T03:55:17.000Z","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:H/I:N/A:N"},"cwe":["CWE-200"],"affected":["luca-app/luca"],"epss":{"score":0.02765,"percentile":0.86202,"date":"2026-10-26","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 (2.77%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/mame82/misc/blob/master/luca_traceIds.md","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://luca-app.de/securityoverview/properties/objectives.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://twitter.com/patrick_hennig/status/1387738281757061125","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://youtu.be/jWyDfEB0m08","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/mame82/misc/blob/master/luca_traceIds.md","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://luca-app.de/securityoverview/properties/objectives.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://twitter.com/patrick_hennig/status/1387738281757061125","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://youtu.be/jWyDfEB0m08","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33839","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."}