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CVE Record

CVE-2017-7757: A use-after-free vulnerability in IndexedDB when one of its objects is destroyed in memory while a method o...

A use-after-free vulnerability in IndexedDB when one of its objects is destroyed in memory while a method on it is still being executed. This results in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2017-7757 is a memory safety flaw in Mozilla IndexedDB. Older Firefox, Firefox ESR, and Thunderbird versions could crash in a way Mozilla described as potentially exploitable. Organizations still running these legacy versions should treat this as a browser and email-client exposure issue.

Executive priority

Prioritize remediation where legacy Mozilla software remains in business use. This is old, but memory corruption in browsers and mail clients remains operationally important because forgotten endpoints often carry the residual risk.

Technical view

The flaw is a use-after-free in IndexedDB when an object is destroyed while one of its methods continues executing. The source data lists Firefox before 54, Firefox ESR before 52.2, and Thunderbird before 52.2 as affected. No CVSS score or CWE is provided in the bundle.

Likely exposure

Exposure is most likely on endpoints, servers, or golden images still carrying unsupported Mozilla Firefox, Firefox ESR, or Thunderbird versions below the fixed release thresholds.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. Mozilla characterized the crash as potentially exploitable, so risk depends on reachable untrusted web or mail content and legacy deployment presence.

Researcher notes

Evidence is limited to the CVE bundle and vendor references. Do not claim exploitation without additional sources. Focus validation on version thresholds, distro backports, and whether IndexedDB-capable browser contexts or Thunderbird message rendering are reachable.

Mitigation direction

  • Upgrade Firefox to 54 or later where still applicable.
  • Upgrade Firefox ESR to 52.2 or later where still applicable.
  • Upgrade Thunderbird to 52.2 or later where still applicable.
  • Apply relevant Debian or Red Hat security advisories for managed Linux systems.
  • Check current Mozilla or OS vendor guidance for unsupported legacy platforms.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions across endpoints.
  • Flag any Firefox version below 54.
  • Flag any Firefox ESR or Thunderbird version below 52.2.
  • Confirm Linux packages include the relevant Debian or Red Hat advisory fixes.
  • Review exposure to untrusted web browsing or HTML email on affected hosts.
Prepared
Confidence
high
Sources
10

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-2017-7757 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
9Source 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
MozillaFirefoxunspecifiedListed
MozillaFirefox ESRunspecifiedListed
MozillaThunderbirdunspecifiedListed
Weakness

CWE details

No CWE listed

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