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CVE-2017-7752: A use-after-free vulnerability during specific user interactions with the input method editor (IME) in some...

A use-after-free vulnerability during specific user interactions with the input method editor (IME) in some languages due to how events are handled. This results in a potentially exploitable crash but would require specific user interaction to trigger. 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 analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2017-7752 is an old Mozilla memory-safety bug that could crash affected Firefox, Firefox ESR, or Thunderbird versions during specific input method editor interactions. Business urgency is mainly legacy risk: supported modern versions should not be affected, but unmanaged old browsers or mail clients may still expose users.

Executive priority

Treat as a legacy cleanup item unless affected versions are still deployed. If old Mozilla clients remain in production, prioritize removal because browser and mail-client memory bugs can become user-driven compromise paths.

Technical view

The issue is a use-after-free in IME event handling for some languages. Mozilla described it as a potentially exploitable crash requiring specific user interaction. Affected versions are Firefox before 54, Firefox ESR before 52.2, and Thunderbird before 52.2.

Likely exposure

Exposure is most likely on legacy endpoints, kiosks, virtual desktops, or servers still running old Mozilla browser or Thunderbird packages, including distro-packaged builds from 2017-era Debian or Red Hat releases.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Triggering requires specific user interaction with IME behavior, so this is not described as a remotely automatic vulnerability in the source bundle.

Researcher notes

The source bundle lacks CVSS and CWE entries. Analysis should stay tied to Mozilla’s description: use-after-free, IME event handling, some languages, user interaction required, potentially exploitable crash, fixed by the listed version thresholds.

Mitigation direction

  • Upgrade Firefox to version 54 or later.
  • Upgrade Firefox ESR to version 52.2 or later.
  • Upgrade Thunderbird to version 52.2 or later.
  • Apply relevant Debian or Red Hat security updates where packaged builds are used.
  • Retire unsupported Mozilla client versions from managed endpoints.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions across endpoints.
  • Confirm package versions meet or exceed the fixed releases.
  • Check Linux fleets against Debian DSA-3881, DSA-3918, and Red Hat RHSA advisories.
  • Review software management reports for unmanaged legacy Mozilla installations.
  • Document any exceptions with compensating controls and retirement dates.
Prepared
Confidence
medium
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

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CVE-2017-7752 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.