CVE-2019-11708
Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
- Critical 10.0
- Exploited: added to CISA KEV 23 May 2022
Description
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.
Key facts
- Published
- 23 Jul 2019
- Last changed
- 21 Oct 2025
- Assigned by
- mozilla
- KEV added
- 23 May 2022
- KEV fix due
- 13 Jun 2022
- EPSS
- 55.874% likely to be exploited in the next 30 days, higher than 99.06% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 10.0CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR |
|
| Mozilla | Firefox |
|
| Mozilla | Thunderbird |
|
Timeline
- 23 Jul 2019 Published
- 23 May 2022 CVE-2019-11708 added to CISA KEV
- 23 May 2022 Added to the CISA KEV catalogue