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CVE Record

CVE-2019-11693: The bufferdata function in WebGL is vulnerable to a buffer overflow with specific graphics drivers on Linux.

The bufferdata function in WebGL is vulnerable to a buffer overflow with specific graphics drivers on Linux. This could result in malicious content freezing a tab or triggering a potentially exploitable crash. *Note: this issue only occurs on Linux. Other operating systems are unaffected.*. 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 analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2019-11693 is a Mozilla WebGL issue that can crash or freeze a tab on Linux systems with specific graphics drivers. Mozilla described the crash as potentially exploitable, but the supplied sources do not show active exploitation. Business urgency is highest for any remaining Linux users on old Firefox, Firefox ESR, or Thunderbird versions.

Executive priority

Treat this as a legacy browser and client hygiene issue. It is not KEV-listed in the supplied data, but outdated Linux Mozilla clients should be remediated because browser crashes can become security incidents when malicious content is involved.

Technical view

The issue is a buffer overflow in WebGL's bufferdata function when used with certain Linux graphics drivers. A malicious page or content could cause a tab freeze or potentially exploitable crash. The CVE states other operating systems are unaffected. Affected products are Thunderbird before 60.7, Firefox before 67, and Firefox ESR before 60.7.

Likely exposure

Exposure is most likely on Linux desktops or servers running outdated Mozilla Firefox, Firefox ESR, or Thunderbird builds from before the fixed versions. Systems on non-Linux operating systems are identified as unaffected in the CVE description.

Exploitation context

The provided bundle does not identify public exploitation, CISA KEV listing, exploit code, or observed attacks. The credible risk is malicious content triggering a denial-of-service condition or potentially exploitable crash in vulnerable Linux environments.

Researcher notes

The source bundle lacks CVSS, CWE, driver details, exploit telemetry, and patch commit analysis. Avoid broadening scope beyond Linux and the listed Mozilla products. Validation should focus on version state, operating system, and whether affected clients remain in use.

Mitigation direction

  • Upgrade Firefox to 67 or later where applicable.
  • Upgrade Firefox ESR to 60.7 or later where applicable.
  • Upgrade Thunderbird to 60.7 or later where applicable.
  • For unsupported deployments, review Mozilla guidance before relying on compensating controls.

Validation and detection

  • Inventory Firefox, Firefox ESR, and Thunderbird versions on Linux endpoints.
  • Confirm whether vulnerable systems use affected-era graphics drivers and WebGL-capable configurations.
  • Verify endpoint management or vulnerability scanner results show fixed Mozilla versions.
  • Document any remaining unsupported systems and their vendor-guided remediation plan.
Prepared
Confidence
high
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-2019-11693 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.