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CVE-2017-5420

18
FAUCET Score

CVE-2017-5420 describes a vulnerability in Firefox versions prior to 52 where a malicious "javascript:" URL could obscure its true location in the address bar, enabling an attacker to spoof legitimate websites without displaying the malicious page's address. This medium-severity vulnerability has a CVSS score of 6.5, indicating it can be exploited over a network with low complexity, requiring user interaction, and primarily impacting integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 52.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 52CPE match
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.29%
Probability of exploitation in next 30 days
EPSS Percentile
67.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0129 is in the 80th percentile among its peer group of 26,221 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mozillapatch availablevia nvd_reference
View patch

References

bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatchVendor Advisory
mozilla.org / security/advisories/mfsa2017-05
Vendor Advisory
securityfocus.com / bid/96692
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037966
Third Party AdvisoryVDB Entry