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CVE Record

CVE-2019-11692: A use-after-free vulnerability can occur when listeners are removed from the event listener manager while s...

A use-after-free vulnerability can occur when listeners are removed from the event listener manager while still in use, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2019-11692 is a Mozilla memory-safety bug. A crash can occur when event listeners are removed while still being used, and Mozilla described it as potentially exploitable. Organizations still running old Firefox, Firefox ESR, or Thunderbird versions should treat this as a meaningful client-side exposure.

Executive priority

Prioritize remediation where legacy Mozilla clients still exist, especially on user workstations handling internet browsing or email. This is an old issue, but unpatched client-side memory corruption remains a practical security concern.

Technical view

The issue is a use-after-free in Mozilla's event listener manager during listener removal while in use. The provided CVE data says it affects Thunderbird before 60.7, Firefox before 67, and Firefox ESR before 60.7. No CVSS score, CWE, or exploit details are provided in the bundle.

Likely exposure

Exposure is most likely on endpoints, virtual desktops, or legacy systems running Firefox < 67, Firefox ESR < 60.7, or Thunderbird < 60.7.

Exploitation context

The bundle does not show CISA KEV listing or confirmed active exploitation. The risk comes from a potentially exploitable memory corruption crash in browser and mail-client software, which may be reachable through untrusted web or message content depending on product use.

Researcher notes

Evidence is limited to the CVE description and Mozilla references in the bundle. The Bugzilla reference may contain implementation details, but the supplied data does not include a public exploit, CVSS vector, or confirmed exploitation status.

Mitigation direction

  • Upgrade Firefox to 67 or later, preferably a current supported release.
  • Upgrade Firefox ESR to 60.7 or later, preferably a current supported ESR release.
  • Upgrade Thunderbird to 60.7 or later, preferably a current supported release.
  • Check Mozilla advisories for product-specific guidance and any deployment constraints.
  • Remove or isolate unsupported Mozilla client versions from managed environments.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions across endpoints.
  • Flag Firefox versions below 67 as affected.
  • Flag Firefox ESR versions below 60.7 as affected.
  • Flag Thunderbird versions below 60.7 as affected.
  • Confirm patch status against Mozilla MFSA 2019-13, 2019-14, and 2019-15.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2019-11692 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaThunderbirdunspecifiedListed
MozillaFirefoxunspecifiedListed
MozillaFirefox ESRunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.