CVE-2017-7763

Name: CVE-2017-7763
Creator: NVD / NIST
Published: 2018-06-11T21:29:08.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.14%

Last modified Jun 17, 2026

CVE-2017-7763 is a vulnerability of currently unknown severity. Default fonts on OS X display some Tibetan characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

Description

Default fonts on OS X display some Tibetan characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

Metrics

EPSS Probability

1.14%

62.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 52.2.0
Mozilla	Firefox	< 54.0
Mozilla	Thunderbird	< 52.2.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

http://www.securityfocus.com/bid/99057Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038689Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1360309Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-15/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-17/Vendor Advisory
http://www.securityfocus.com/bid/99057Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038689Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1360309Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-15/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-17/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2017-7763?

How severe is CVE-2017-7763?

Severity scoring for CVE-2017-7763 is pending analysis. The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7763?

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-2017-7763?

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

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Source: NVD / NIST