CVE-2020-12388
This vulnerability affects Firefox ESR < 68.8 and Firefox < 76.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape. *Note: this issue only affects Firefox on Windows operating systems.*. This vulnerability affects Firefox ESR < 68.8 and Firefox < 76.
- CVSS 3.1
- 10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 3.52% probability · 89th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- mozilla/firefox · mozilla/firefox esr
- Source
- security@mozilla.org
EPSS 3.5% since 26 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://packetstormsecurity.com/files/157860/Firefox-Default-Content-Process-DACL-Sandbox-Escape.htmlThird Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1618911Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-17/Vendor Advisory
- http://packetstormsecurity.com/files/157860/Firefox-Default-Content-Process-DACL-Sandbox-Escape.htmlThird Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1618911Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-17/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.