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CVE-2020-12388
CRITICAL
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.
Published: May 26, 2020
Modified: Jun 17, 2026
CWE-20
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected Products (2)
| Vendor | Product | Version |
|---|---|---|
| mozilla | firefox | * < 76.0 |
| mozilla | firefox_esr | * < 68.8.0 |
GitHub Security Advisory GHSA-fx7p-g7cp-xx65
The Firefox content processes did not sufficiently lockdown access control which could result in...
References (8)
- http://packetstormsecurity.com/files/157860/Firefox-Default-Content-Process-DACL-Sandbox-Escape.html Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1618911 Issue 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.html Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1618911 Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-16/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-17/ Vendor Advisory
Risk Scores
CVSS Score
10.0 / 10
EPSS Score
2.71%
Top 15% most likely to be exploited
Threat Score
40.8 / 100
Data Sources
NVD
EPSS
GitHub