CVE-2019-11708
KEVMozilla Firefox and Thunderbird Sandbox Escape Vulnerability
Description
Mozilla Firefox and Thunderbird contain a sandbox escape vulnerability that could result in remote code execution.
Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HPublishedJul 23, 2019
Last modifiedJun 17, 2026
Added to KEVMay 23, 2022
Remediation dueJun 13, 2022
References
- packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.htmlThird Party AdvisoryVDB Entry
- bugzilla.mozilla.org/show_bug.cgi?id=1559858Issue TrackingVendor Advisory
- security.gentoo.org/glsa/201908-12Third Party Advisory
- mozilla.org/security/advisories/mfsa2019-19/Vendor Advisory
- mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11708US Government Resource
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Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1596 days
- CVSS
- 10.0 CRITICAL
- EPSS (30-day exploit probability)
- 55.9% · top 1% of all CVEs
- Weakness
- CWE-20
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.