CVE-2017-5383
URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger punycode display, allowing for domain name spoofing attacks in the location bar.
Does this matter?
Lower severity and a low EPSS score (2.41%). Track it; it rarely justifies an emergency change on its own.
Description
URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger punycode display, allowing for domain name spoofing attacks in the location bar. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.
- CVSS 3.0
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 2.41% probability · 84th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- debian/debian linux · redhat/enterprise linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux workstation · mozilla/thunderbird · mozilla/firefox
- Source
- security@mozilla.org
EPSS 2.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://rhn.redhat.com/errata/RHSA-2017-0190.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0238.htmlThird Party Advisory
- http://www.securityfocus.com/bid/95769Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037693Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1323338Issue Tracking, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1324716Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/201702-13Third Party Advisory
- https://security.gentoo.org/glsa/201702-22Third Party Advisory
- https://www.debian.org/security/2017/dsa-3771Third Party Advisory
- https://www.debian.org/security/2017/dsa-3832Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-01/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-02/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-03/Vendor Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0190.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0238.htmlThird Party Advisory
- http://www.securityfocus.com/bid/95769Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037693Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1323338Issue Tracking, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1324716Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/201702-13Third Party Advisory
- https://security.gentoo.org/glsa/201702-22Third Party Advisory
- https://www.debian.org/security/2017/dsa-3771Third Party Advisory
- https://www.debian.org/security/2017/dsa-3832Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-01/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-02/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-03/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.