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Vulnerability record · CVE-2017-7783 · published 11 June 2018

CVE-2017-7783: Mozilla firefox improper input validation vulnerability

Mozilla · Firefox

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.

7.5 CVSS 3.0 High EPSS 14% · top 3.6% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/100401 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039124 Third Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1360842 ExploitIssue TrackingPatch
https://www.exploit-db.com/exploits/43020/ Third Party AdvisoryVDB Entry
https://www.mozilla.org/security/advisories/mfsa2017-18/ Vendor Advisory
http://www.securityfocus.com/bid/100401 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039124 Third Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1360842 ExploitIssue TrackingPatch
https://www.exploit-db.com/exploits/43020/ Third Party AdvisoryVDB Entry
https://www.mozilla.org/security/advisories/mfsa2017-18/ Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-7783), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.