CVE-2017-5420
A "javascript:" url loaded by a malicious page can obfuscate its location by blanking the URL displayed in the addressbar, allowing for an attacker to spoof an existing page without the malicious page's address being displayed correctly.
Does this matter?
Lower severity and a low EPSS score (1.25%). Track it; it rarely justifies an emergency change on its own.
Description
A "javascript:" url loaded by a malicious page can obfuscate its location by blanking the URL displayed in the addressbar, allowing for an attacker to spoof an existing page without the malicious page's address being displayed correctly. This vulnerability affects Firefox < 52.
- CVSS 3.0
- 6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- EPSS
- 1.25% probability · 69th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
EPSS 1.3% 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://www.securityfocus.com/bid/96692Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037966Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1284395Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-05/Vendor Advisory
- http://www.securityfocus.com/bid/96692Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037966Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1284395Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-05/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.