CVE-2019-11708
Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- 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
- 55.87% probability · 99th percentile
- Public exploits
- 1 in Exploit-DB · first 7 December 2019
- CISA KEV
- Listed 23 May 2022 · due 13 June 2022
- Weakness
- CWE-20
- Affected
- mozilla/firefox · mozilla/thunderbird
- Source
- security@mozilla.org
EPSS 55.9% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-11708
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.htmlThird Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1559858Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/201908-12Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-19/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
- http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.htmlThird Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1559858Issue Tracking, Vendor Advisory
- https://security.gentoo.org/glsa/201908-12Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-19/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11708US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.