CVE-2019-9809

Name: CVE-2019-9809
Creator: NVD / NIST
Published: 2019-04-26T17:29:03.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.64%

Last modified Jun 17, 2026

CVE-2019-9809 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.64% chance of exploitation in the next 30 days.

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

EPSS Probability

1.64%

73.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 66.0

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
Status: Modified

Frequently Asked Questions

What is CVE-2019-9809?

How severe is CVE-2019-9809?

Severity scoring for CVE-2019-9809 is pending analysis. The EPSS model estimates a 1.64% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9809?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9809?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST