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CVE Record

CVE-2017-7825: Several fonts on OS X display some Tibetan and Arabic characters as whitespace.

Several fonts on OS X display some Tibetan and Arabic characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw could let a deceptive internationalized domain name look more trustworthy in Firefox or Thunderbird on OS X because some Tibetan and Arabic characters rendered as blank space. The realistic business risk is phishing and user misdirection, not direct system compromise.

Executive priority

Treat as a targeted phishing-enablement issue for legacy macOS browser and mail clients. Prioritize remediation if affected Mozilla versions remain in the estate, especially for credentialed business users.

Technical view

CVE-2017-7825 is an IDN display spoofing issue caused by OS X font rendering behavior. Mozilla states it affects Firefox before 56, Firefox ESR before 52.4, and Thunderbird before 52.4. Other operating systems are noted as unaffected in the source description.

Likely exposure

Exposure is limited to users on OS X running affected Mozilla versions, especially where users follow links, read email, or type credentials after trusting browser address-bar or mail-rendered domain cues.

Exploitation context

The source describes domain spoofing potential through characters displayed as whitespace in the address bar. KEV is false and the provided sources do not state active exploitation, public weaponization, or exploitation at scale.

Researcher notes

Evidence is strongest for affected products and OS limitation. The bundle does not provide CVSS, CWE, proof of active exploitation, or detailed patch mechanics beyond affected-version thresholds and vendor advisories.

Mitigation direction

  • Upgrade Firefox to 56 or later where still present.
  • Upgrade Firefox ESR to 52.4 or later where still present.
  • Upgrade Thunderbird to 52.4 or later where still present.
  • Apply relevant OS package advisories for Debian or Gentoo managed systems.
  • Prefer currently supported Mozilla releases over legacy fixed versions.

Validation and detection

  • Inventory OS X endpoints running Firefox, Firefox ESR, or Thunderbird.
  • Confirm installed versions are not below the affected fixed thresholds.
  • Check software management records for Debian DLA or Gentoo GLSA application.
  • Review phishing controls for IDN and lookalike-domain detection coverage.
  • Verify legacy Mozilla builds are removed from managed macOS systems.
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

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CVE-2017-7825 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
8Source 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.