CVE-2017-5397

9.8 criticalEPSS 3.6%

Critical (9.8) in mozilla firefox. EPSS 3.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.0

9.8 critical

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

EPSS: 3.6% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
CWE: CWE-829
Published: 2018-06-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

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

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