CVE-2017-5456
A mechanism to bypass file system access protections in the sandbox using the file system request constructor through an IPC message.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.73% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-732
- Affected
- redhat/enterprise linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux workstation · mozilla/firefox
- Source
- security@mozilla.org
EPSS 2.7% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/97940Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038320Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1106Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1344415Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-10/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-12/Vendor Advisory
- http://www.securityfocus.com/bid/97940Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038320Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1106Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1344415Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-10/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-12/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.