# CVE-2019-11708: Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability

> CVE-2019-11708: Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability. CVSS 10.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-11708
Last updated: 2025-10-21T23:45:33Z

- Published: 2019-07-23 13:20 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: mozilla
- CVSS: 10.0 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS: 55.9%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-23, federal due date 2022-06-13, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Mozilla: Firefox
- Mozilla: Firefox ESR
- Mozilla: Thunderbird

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-11708)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-11708)
- [http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html](http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=1559858](https://bugzilla.mozilla.org/show_bug.cgi?id=1559858)
- [https://security.gentoo.org/glsa/201908-12](https://security.gentoo.org/glsa/201908-12)
- [https://www.mozilla.org/security/advisories/mfsa2019-19/](https://www.mozilla.org/security/advisories/mfsa2019-19/)
- [https://www.mozilla.org/security/advisories/mfsa2019-20/](https://www.mozilla.org/security/advisories/mfsa2019-20/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-11708 · Markdown: https://rewindex.com/cve/CVE-2019-11708.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-11708 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:05:56.533Z