CVE-2017-7783
Mozilla: DOS attack through long username in URL (MFSA 2017-18)
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Severity
LowRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · August 8, 2017
Updated · November 22, 2025
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 score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE not specified