Security readout for executives and security teams
Plain-English summary
This is a Windows-only Mozilla sandbox information leak. Older Firefox, Firefox ESR, and Thunderbird builds could expose an uninitialized memory value from a privileged broker process to a renderer during a blocked file-access request. The sources describe potential information disclosure, not code execution. No active exploitation is cited in the supplied sources.
Executive priority
Treat this as a moderate-priority legacy client risk. It is not cited as actively exploited, but affected versions are old and should not remain in production. The fastest risk reduction is confirming Windows endpoint versions and removing or upgrading any affected Mozilla installations.
Technical view
CVE-2019-11694 involves uninitialized memory in Windows sandbox broker-to-renderer handling. A renderer requesting access to an otherwise unavailable file could receive a leaked memory value from the broker. Affected products are Thunderbird before 60.7, Firefox before 67, and Firefox ESR before 60.7. Mozilla states other operating systems are unaffected.
Likely exposure
Likely exposure is Windows endpoints running unsupported or very old Mozilla Firefox, Firefox ESR, or Thunderbird versions below the fixed releases. Non-Windows deployments are described as unaffected. Modern managed fleets should mainly treat this as a legacy-version discovery and patch-compliance issue.
Exploitation context
The supplied sources do not report active exploitation, and the CVE is not marked KEV. They also do not provide CVSS scoring or exploit maturity. The issue is an information disclosure bug inside sandboxed browser or mail-client behavior, so business urgency depends on whether affected legacy Windows clients remain in use.
Researcher notes
The public description is narrow: Windows sandbox broker-to-renderer information disclosure through uninitialized memory during an unavailable file-access call. Evidence does not identify leaked data type, attack prerequisites, or a standalone exploit path. Avoid broad claims beyond the affected Mozilla products and versions listed by Mozilla and CVE records.
Mitigation direction
- Upgrade Firefox to version 67 or later on Windows systems.
- Upgrade Firefox ESR to version 60.7 or later.
- Upgrade Thunderbird to version 60.7 or later.
- Prioritize removal of unsupported Mozilla versions from managed Windows endpoints.
- Check Mozilla advisories for any environment-specific vendor guidance.
Validation and detection
- Inventory Windows endpoints for Firefox, Firefox ESR, and Thunderbird versions.
- Flag Firefox versions earlier than 67 as affected.
- Flag Firefox ESR and Thunderbird versions earlier than 60.7 as affected.
- Confirm non-Windows systems are excluded from this specific CVE scope.
- Review patch management records for the May 2019 Mozilla fixed releases.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-11694 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mozilla.org/security/advisories/mfsa2019-13/CVE reference · x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2019-15/CVE reference · x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2019-14/CVE reference · x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1534196CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.