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CVE-2019-11708 Mozilla CVE debrief

CVE-2019-11708 is described as a sandbox escape vulnerability affecting Mozilla Firefox and Thunderbird. CISA includes it in the Known Exploited Vulnerabilities catalog, so it should be treated as a high-priority remediation item for any environment running these products. The supplied corpus does not provide CVSS data or exploit details, so the safest defensive response is to apply vendor updates and verify that every installed instance is covered.

Vendor
Mozilla
Product
Firefox and Thunderbird
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-05-23
Original CVE updated
2022-05-23
Advisory published
2022-05-23
Advisory updated
2022-05-23

Who should care

Security and IT teams responsible for Mozilla Firefox and Thunderbird deployments, especially endpoint, desktop, and fleet management owners who need to rapidly patch or validate remediation across user systems.

Technical summary

The supplied records describe CVE-2019-11708 as a sandbox escape affecting Mozilla Firefox and Thunderbird. In practical terms, a sandbox escape can reduce the protection normally provided by the application’s isolation boundary, so remediation matters even when the issue description is brief. CISA’s KEV listing indicates the vulnerability is important enough to track as a known exploited item and to prioritize for patching.

Defensive priority

Urgent

Recommended defensive actions

  • Apply Mozilla vendor updates per the official remediation guidance.
  • Inventory all Firefox and Thunderbird installations to confirm no unmanaged or forgotten instances remain.
  • Prioritize remediation on exposed endpoints and user workstations that regularly process untrusted web or email content.
  • Validate that patch deployment completed before the CISA KEV due date in your environment.
  • Track the official CVE and NVD records for any later updates or clarifications.

Evidence notes

Evidence is limited to the supplied CISA KEV source item and the linked official CVE/NVD references. The corpus identifies the issue as a Mozilla Firefox and Thunderbird sandbox escape vulnerability, marks it as a known exploited vulnerability, and provides the KEV dateAdded of 2022-05-23 with dueDate of 2022-06-13. No CVSS score or exploit mechanics were included in the supplied data.

Official resources

CISA added this CVE to the KEV catalog on 2022-05-23 and set a due date of 2022-06-13. The supplied corpus does not include exploit code, attack steps, or a CVSS score, so this debrief stays limited to the documented records and official CV