HOMEVULNERABILITIESCVE-2017-5397
CRITICAL

CVE-2017-5397

CWE-829Published: June 11, 2018· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The cache directory on the local file system is set to be world writable. Firefox defaults to extracting libraries from this cache. This allows for the possibility of an installed malicious application or tools with write access to the file system to replace files used by Firefox with their own versions. This vulnerability affects Firefox < 51.0.3.

NVD Source

Technical Analysis

CVE-2017-5397 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Mozilla1 product(s)
firefox
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.mozilla.org/show_bug.cgi?id=1337304
PATCHhttps://bugzilla.mozilla.org/show_bug.cgi?id=1337304
ADVISORYhttp://www.securityfocus.com/bid/96144
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2017-04/
ADVISORYhttp://www.securityfocus.com/bid/96144
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2017-04/

All References (6)

→
http://www.securityfocus.com/bid/96144Third Party Advisory · VDB Entry
→
https://bugzilla.mozilla.org/show_bug.cgi?id=1337304Issue Tracking · Patch · Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2017-04/Vendor Advisory
→
http://www.securityfocus.com/bid/96144Third Party Advisory · VDB Entry
→
https://bugzilla.mozilla.org/show_bug.cgi?id=1337304Issue Tracking · Patch · Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2017-04/Vendor Advisory

Quick Facts

CVE IDCVE-2017-5397
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-829
CISA KEVNo
Affected1 vendor(s)
PublishedJun 11, 2018

Related CVEs (CWE-829)

CVE-2020-4561
10.0
CVE-2025-0982
10.0
CVE-2026-27941
9.9
CVE-2012-4919
9.8
CVE-2025-27668
9.8
CVE-2004-0030
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-5397 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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