CVE-2017-7838

Name: CVE-2017-7838
Creator: NVD / NIST
Published: 2018-06-11T21:29:11.733+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.47%

Last modified Jun 17, 2026

CVE-2017-7838 is a vulnerability of currently unknown severity. Punycode format text will be displayed for entire qualified international domain names in some instances when a sub-domain triggers the punycode display instead of the primary domain being displayed in native script and the sub-domain only displaying as punycode. This could be used for limited spoofing attacks due to user confusion. EPSS estimates a 1.47% chance of exploitation in the next 30 days.

Description

Punycode format text will be displayed for entire qualified international domain names in some instances when a sub-domain triggers the punycode display instead of the primary domain being displayed in native script and the sub-domain only displaying as punycode. This could be used for limited spoofing attacks due to user confusion. This vulnerability affects Firefox < 57.

Metrics

EPSS Probability

1.47%

70.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 56.0.2

References

http://www.securityfocus.com/bid/101832Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039803Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1399540Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2017-24/Vendor Advisory
http://www.securityfocus.com/bid/101832Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039803Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1399540Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2017-24/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2017-7838?

How severe is CVE-2017-7838?

Severity scoring for CVE-2017-7838 is pending analysis. The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7838?

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-2017-7838?

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

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Source: NVD / NIST