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CVE-2017-7783

HighPublished

If a long user name is used in a username/password combination in a site URL (such as " http://UserName:[email protected]"), the resulting modal prompt...

Published: Jun 11, 2018
Updated: Aug 5, 2024
Assigning CNA: mozilla
Evidence observed: Oct 20, 2017

Primary CVSS

7.5/ 10High

nvd · CVSS 3.0

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

EPSS probability estimate

10.3%

Moderate · next 30 days

Percentile: 95.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

If a long user name is used in a username/password combination in a site URL (such as " http://UserName:[email protected]"), the resulting modal prompt will hang in a non-responsive state or crash, causing a denial of service. This vulnerability affects Firefox < 55.

Sources

Mozilla Firefox < 55 - Denial of ServiceExploit
Amit Sangra · multiple · Oct 20, 2017

Responsible use

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