CVE-2018-5121 json
Low descenders on some Tibetan characters in several fonts on OS X are clipped when rendered in the addressbar.
published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16907
- cvss
- 5.3
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 73%
- public exploits
- 0
- none known
Summary
Low descenders on some Tibetan characters in several fonts on OS X are clipped when rendered in the addressbar. When used as part of an Internationalized Domain Name (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 < 58.
Patch / fix
- Mozilla Firefox 58
- firefox-esr openSUSE Tumbleweed 128.5.1-1.1
- MozillaFirefox openSUSE Tumbleweed 92.0-1.2
opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1
Exploit prediction
1.44% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Mozilla Firefox
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
mozilla.org
/security/advisories/mfsa2018-02/
vendor-advisory
-
securitytracker.com
/id/1040270
vdb-entry, third-party-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1402368
issue-tracking, permissions-required
-
securityfocus.com
/bid/102786
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2018-5121
- NVD CVE-2018-5121
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