What’s Vulnerable › Vulnerabilities

CVE-2017-5456

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-732

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.

Affected products

• Mozilla Firefox: before 53.0; before 52.1.0 — fixed in 52.1.0, 53.0
• Red Hat Enterprise Linux: 7.0
• RedHat Enterprise Linux Desktop: 7.0
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Server Aus: 7.3, 7.4
• RedHat Enterprise Linux Server Eus: 7.3, 7.4, 7.5
• RedHat Enterprise Linux Workstation: 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 52.1.0, 53.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/97940
• http://www.securitytracker.com/id/1038320
• https://access.redhat.com/errata/RHSA-2017:1106
• https://bugzilla.mozilla.org/show_bug.cgi?id=1344415
• https://www.mozilla.org/security/advisories/mfsa2017-10/
• https://www.mozilla.org/security/advisories/mfsa2017-12/
• http://www.securityfocus.com/bid/97940
• http://www.securitytracker.com/id/1038320
• https://access.redhat.com/errata/RHSA-2017:1106
• https://bugzilla.mozilla.org/show_bug.cgi?id=1344415
• https://www.mozilla.org/security/advisories/mfsa2017-10/
• https://www.mozilla.org/security/advisories/mfsa2017-12/

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