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CVE-2017-7763

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…

Medium5.3EPSS 1.1%
Published
Updated
Reserved
Assigned by
mozilla

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.

Scores

CVSS scores of CVE-2017-7763, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS (exploitation in 30 days)
1.1% · top 34% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

Affected products

  • Mozilla · Firefox

    • affected unspecified – < 54

  • Mozilla · Firefox ESR

    • affected unspecified – < 52.2

  • Mozilla · Thunderbird

    • affected unspecified – < 52.2

References (6)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .