Modal Authentication Prompt Denial of Service (DOS) Vulnerability in Firefox and Thunderbird Versions < 52

CVE-2017-5419 · HIGH Severity

AV:N/AC:L/AU:N/C:N/I:N/A:C

If a malicious site repeatedly triggers a modal authentication prompt, eventually the browser UI will become non-responsive, requiring shutdown through the operating system. This is a denial of service (DOS) attack. This vulnerability affects Firefox < 52 and Thunderbird < 52.

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