vulnerability
MFSA2017-12 Firefox: Security vulnerabilities fixed in Firefox ESR 52.1 (CVE-2017-5456)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:P/I:P/A:P) | Apr 19, 2017 | Apr 20, 2017 | Mar 27, 2026 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:P/I:P/A:P)
Published
Apr 19, 2017
Added
Apr 20, 2017
Modified
Mar 27, 2026
Description
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.
Solution
mozilla-firefox-esr-upgrade-52_1
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.