Vulnerability in Mozilla Firefox

CVE-2017-5456

A mechanism to bypass file system access protections in the sandbox using the file system request constructor through an IPC message. This allows for read and write access to the local file system. This vulnerability affects Firefox ESR < 52.1 and Firefox < 53.

EPSS: 0.028 (85.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2017-5456?
CVE-2017-5456 is a critical-severity vulnerability in Mozilla Firefox, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 9.8/10. Published 2018-06-11.
How severe is CVE-2017-5456?
Critical severity. CVSS v3 base score is 9.8 out of 10.