CVE-2021-33839 - Vulnerability Details - OpenCVE

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: 2021-06-03

Score: 7.5 High

EPSS: 2.8% Low

KEV: No

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

cpe:2.3:a:luca-app:luca:*:*:*:*:*:android:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-20513	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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact None

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.02765.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/mame82/misc/blob/master/luca_traceIds.md
https://luca-app.de/securityoverview/properties/objectives.html
https://twitter.com/patrick_hennig/status/1387738281757061125
https://youtu.be/jWyDfEB0m08

History

No history.

Subscriptions

Luca-app Luca

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-06-03T23:58:01.000Z

Updated: 2024-08-03T23:58:23.171Z

Reserved: 2021-06-03T00:00:00.000Z

Link: CVE-2021-33839

Vulnrichment

No data.

NVD

Status : Modified

Published: 2021-06-04T00:15:07.377

Modified: 2026-06-17T03:55:17.490

Link: CVE-2021-33839

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-200
Exposure of Sensitive Information to an Unauthorized Actor

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-06-03T23:58:01.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/mame82/misc/blob/master/luca_traceIds.md"}, {"tags": ["x_refsource_MISC"], "url": "https://luca-app.de/securityoverview/properties/objectives.html"}, {"tags": ["x_refsource_MISC"], "url": "https://youtu.be/jWyDfEB0m08"}, {"tags": ["x_refsource_MISC"], "url": "https://twitter.com/patrick_hennig/status/1387738281757061125"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-33839", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://github.com/mame82/misc/blob/master/luca_traceIds.md", "refsource": "MISC", "url": "https://github.com/mame82/misc/blob/master/luca_traceIds.md"}, {"name": "https://luca-app.de/securityoverview/properties/objectives.html", "refsource": "MISC", "url": "https://luca-app.de/securityoverview/properties/objectives.html"}, {"name": "https://youtu.be/jWyDfEB0m08", "refsource": "MISC", "url": "https://youtu.be/jWyDfEB0m08"}, {"name": "https://twitter.com/patrick_hennig/status/1387738281757061125", "refsource": "MISC", "url": "https://twitter.com/patrick_hennig/status/1387738281757061125"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T23:58:23.171Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/mame82/misc/blob/master/luca_traceIds.md"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://luca-app.de/securityoverview/properties/objectives.html"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://youtu.be/jWyDfEB0m08"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://twitter.com/patrick_hennig/status/1387738281757061125"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-33839", "datePublished": "2021-06-03T23:58:01.000Z", "dateReserved": "2021-06-03T00:00:00.000Z", "dateUpdated": "2024-08-03T23:58:23.171Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:luca-app:luca:*:*:*:*:*:android:*:*", "matchCriteriaId": "B1F90DF1-4F29-4F8F-9C8C-239D7B774FAD", "versionEndIncluding": "1.7.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Luca a trav\u00e9s de la versi\u00f3n 1.7.4 en Android permite a los atacantes remotos obtener informaci\u00f3n sensible sobre el seguimiento de COVID-19 porque el c\u00f3digo QR de una Ubicaci\u00f3n P\u00fablica puede ser confundido intencionalmente con el c\u00f3digo QR de una Reuni\u00f3n Privada"}], "id": "CVE-2021-33839", "lastModified": "2026-06-17T03:55:17.490", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-04T00:15:07.377", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://github.com/mame82/misc/blob/master/luca_traceIds.md"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://luca-app.de/securityoverview/properties/objectives.html"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://twitter.com/patrick_hennig/status/1387738281757061125"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://youtu.be/jWyDfEB0m08"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/mame82/misc/blob/master/luca_traceIds.md"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://luca-app.de/securityoverview/properties/objectives.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://twitter.com/patrick_hennig/status/1387738281757061125"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://youtu.be/jWyDfEB0m08"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "nvd@nist.gov", "type": "Primary"}]}