Information Exposure Affecting firefox-esr package, versions <140.8.0esr-1~deb13u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
2.16% (80th percentile)

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  • Snyk IDSNYK-ECHOLATEST-FIREFOXESR-18169204
  • published22 Jul 2026
  • disclosed28 May 2019

Introduced: 28 May 2019

CVE-2019-12383  (opens in a new tab)
CWE-203  (opens in a new tab)

How to fix?

Upgrade Echo:latest firefox-esr to version 140.8.0esr-1~deb13u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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 Base Scores

version 3.1