CVE-2017-7770: Mozilla Firefox vulnerability

CVE-2017-7770: A mechanism where when a new tab is loaded through JavaScript events, if fullscreen mode is then entered, t...

A mechanism where when a new tab is loaded through JavaScript events, if fullscreen mode is then entered, the addressbar will not be rendered. This would allow a malicious site to displayed a spoofed addressbar, showing the location of an arbitrary website instead of the one loaded. Note: this issue only affects Firefox for Android. Desktop Firefox is unaffected. This vulnerability affects Firefox < 54.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 16:12 UTC (UTC+00:00)

Security readout for executives and security teams

This is a phishing and trust-spoofing issue in old Firefox for Android. A malicious site could hide the real browser address bar after opening a tab and entering fullscreen, then display a fake address bar for a trusted site. The sources do not describe code execution or direct data theft. Exposure is limited to users or managed Android devices still running Firefox for Android versions earlier than 54. Modern, automatically updated Firefox Android installations are unlikely to remain affected, but legacy Android fleets or unmanaged devices should be checked. Treat this as a targeted mobile phishing risk, not an infrastructure emergency. Priority is moderate if legacy Android browsers exist in the environment and low if Firefox for Android is centrally updated or absent. Mitigation focus: Upgrade Firefox for Android to version 54 or later.; Confirm Android device management policies enforce browser updates.; Remove or restrict unsupported Firefox for Android 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

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

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://bugzilla.mozilla.org/show_bug.cgi?id=1317242CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2017-15/CVE 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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