CVE-2017-7783

Name: CVE-2017-7783
Creator: NVD / NIST
Published: 2018-06-11T21:29:09.03+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 13.70%

Last modified Jun 17, 2026

CVE-2017-7783 is a vulnerability of currently unknown severity. If a long user name is used in a username/password combination in a site URL (such as " http://UserName:Password@example.com"), the resulting modal prompt will hang in a non-responsive state or crash, causing a denial of service. This vulnerability affects Firefox < 55.. EPSS estimates a 13.70% chance of exploitation in the next 30 days.

Description

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

Metrics

EPSS Probability

13.70%

96.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 55.0

References

http://www.securityfocus.com/bid/100401Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039124Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1360842Exploit, Issue Tracking, Patch
https://www.exploit-db.com/exploits/43020/Third Party Advisory, VDB Entry
https://www.mozilla.org/security/advisories/mfsa2017-18/Vendor Advisory
http://www.securityfocus.com/bid/100401Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039124Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1360842Exploit, Issue Tracking, Patch
https://www.exploit-db.com/exploits/43020/Third Party Advisory, VDB Entry
https://www.mozilla.org/security/advisories/mfsa2017-18/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-7783?

How severe is CVE-2017-7783?

Severity scoring for CVE-2017-7783 is pending analysis. The EPSS model estimates a 13.70% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7783?

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-2017-7783?

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

Scan your code now

Source: NVD / NIST