CVE-2019-9806

HIGH 7.5CVE-2019-9806 · Published 26/04/2019 · updated 17/06/2026

In short

CVE-2019-9806 is a HIGH (CVSS 7.5) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 1.1%, higher than 65.3% of all vulnerabilities.
Fix: update to 66.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 66.0`	`66.0`

Description

A vulnerability exists during authorization prompting for FTP transaction where successive modal prompts are displayed and cannot be immediately dismissed. This allows for a denial of service (DOS) attack. This vulnerability affects Firefox < 66.

References

bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
mozilla.org/security/advisories/mfsa2019-07 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 66.0

66.0

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