CVE-2017-7838: Mozilla Firefox vulnerability

CVE-2017-7838: Punycode format text will be displayed for entire qualified international domain names in some instances wh...

Punycode format text will be displayed for entire qualified international domain names in some instances when a sub-domain triggers the punycode display instead of the primary domain being displayed in native script and the sub-domain only displaying as punycode. This could be used for limited spoofing attacks due to user confusion. This vulnerability affects Firefox < 57.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 16:19 UTC (UTC+00:00)

Security readout for executives and security teams

Firefox before version 57 could display some internationalized domain names in a confusing punycode form when a subdomain triggered that display behavior. The business risk is user deception: attackers could use unusual domain presentation to support limited spoofing or phishing scenarios. This is not described as code execution or system compromise. Exposure is mainly legacy Firefox installations below version 57. Modern managed browsers should be unaffected if they are kept current. Organizations with old kiosk images, frozen VDI builds, or unmanaged endpoints are the most plausible exposure points. Treat as low urgency unless legacy Firefox remains in production. The main concern is phishing support, not direct device compromise. Remediate through browser currency controls and legacy endpoint cleanup. Mitigation focus: Upgrade Firefox to version 57 or later.; Check Mozilla advisory MFSA 2017-24 for vendor guidance.; Remove or isolate unsupported legacy Firefox builds..

Prepared: Jun 7, 2026, 06:44 UTC (UTC+00:00)

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

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 11, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

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

Source materials

CVE List V5 sourceCVE List V5
https://www.mozilla.org/security/advisories/mfsa2017-24/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1399540CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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