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CVE-2017-5427

17
FAUCET Score

CVE-2017-5427 describes a vulnerability in Mozilla Firefox versions prior to 52 where a non-existent chrome.manifest file could be loaded from the installation directory during startup. A local attacker could place a malicious chrome.manifest file and associated components in this directory, leading to the unauthorized loading and activation of malicious software or modification of installed files. This vulnerability has a CVSS score of 5.5 (Medium), indicating a local attack vector with low complexity and high integrity impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for 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

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.24%
Probability of exploitation in next 30 days
EPSS Percentile
15.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0024 is in the 66th percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 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
Issue 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