CVE-2019-9809

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

If the source for resources on a page is through an FTP connection, it is possible to trigger a series of modal alert messages for these resources through invalid credentials or locations. These messages cannot be immediately dismissed, allowing for a denial of service (DOS) attack. This vulnerability affects Firefox < 66.

Metrics

CVSS 3.0 7.5/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-399

Affected software

Vendor	Product	Versions
Mozilla	Firefox	>= unspecified, < 66

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1282430Exploit, Issue Tracking, Patch, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1523249Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1282430Exploit, Issue Tracking, Patch, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1523249Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory

Timeline

Published: Apr 26, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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