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…
- 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.
Timeline
ID reserved
By mozilla
- 14 months later
· 14 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.3 | CVSS: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 (8 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
- Mac fonts render some unicode characters as spaces
- CWE-20 (opens in a new tab)All about CWE-20 and its CVEs
Affected products
- affected unspecified – < 54
- affected unspecified – < 52.2
- affected unspecified – < 52.2
References (6)
- 99057 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-15/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1360309 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1038689 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-17/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-16/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2017-7763)Record last updated .