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Vulnerabilities

Vulnerability · CVE-2019-11708

Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability

Published Jun 20, 2019 · catalog updated Jun 16, 2026 · Mozilla Firefox and Thunderbird

Patch now

CVE-2019-11708 is in the CISA known-exploited catalog, due Jun 13, 2022. Confirm Mozilla Firefox and Thunderbird against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical10.0
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
55.87%
Remediation
Remediation guidance
Affected products
cpe mozilla/firefox · cpe mozilla/thunderbird · vendor Mozilla Firefox and Thunderbird

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mozilla/firefoxversion unspecified
  • cpe mozilla/thunderbirdversion unspecified
  • vendor Mozilla Firefox and Thunderbirdversion unspecified

How to fix CVE-2019-11708

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2019-11708 is in the CISA known-exploited catalog, due Jun 13, 2022. Confirm Mozilla Firefox and Thunderbird against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 55.87%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 23, 2019 · Catalog

    Detected

    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, a

  2. May 23, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jun 13, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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, a

Sources

  • CISA KEVConfirmed exploitationCVE-2019-11708

    Mozilla Firefox and Thunderbird contain a sandbox escape vulnerability that could result in remote code execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2019-11708

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-11708

    30-day exploitation probability 55.9%

    first.org
  • Exploit DatabasePublic exploit reference47752

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • NIST NVDVulnerability recordCVE-2019-11708

    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

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2019-11708

    Mozilla Firefox and Thunderbird contain a sandbox escape vulnerability that could result in remote code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.