CVE-2019-12383

MEDIUMNVD 4.34.3—

4.3

Tor Browser before 8.0.1 has an information exposure vulnerability. It allows remote attackers to detect the browser's UI locale by measuring a button width, even if the user has a "Don't send my language" setting.

CVSS v3: 4.3
EG Score: 4.3(medium)
EPSS: 72.2%
KEV: Not listed

Published

May 28, 2019

Last Modified

November 21, 2024

References (8)

cve@mitrehttp://www.securityfocus.com/bid/108484
cve@mitrehttps://gitweb.torproject.org/tor-browser.git/commit/?id=cbb04b72c68272c2de42f157d40cd7d29a6b7b55
cve@mitrehttps://hackerone.com/reports/282748
cve@mitrehttps://trac.torproject.org/projects/tor/ticket/24056
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/108484
af854a3a-2127-422b-91ae-364da2661108https://gitweb.torproject.org/tor-browser.git/commit/?id=cbb04b72c68272c2de42f157d40cd7d29a6b7b55
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/282748
af854a3a-2127-422b-91ae-364da2661108https://trac.torproject.org/projects/tor/ticket/24056

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-203Observable Discrepancy (Information Exposure via Side Channel)

Data Freshness Timeline

(refreshed 9× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 19:02 UTCEG score recompute
2026-05-27 19:02 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 00:15 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-12383?

CVE-2019-12383 is a medium vulnerability published on May 28, 2019. Tor Browser before 8.0.1 has an information exposure vulnerability. It allows remote attackers to detect the browser's UI locale by measuring a button width, even if the user has a "Don't send my language" setting.

When was CVE-2019-12383 disclosed?

CVE-2019-12383 was first published in the National Vulnerability Database on May 28, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-12383 actively exploited?

CVE-2019-12383 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-12383?

CVE-2019-12383 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2019-12383?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-12383, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2019-12383

📅 Published

🔄 Last Modified

🔗 References (8)