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TI-2017-05434 Aliases CVE-2017-7817GHSA-9f34-96p5-45qg

Improper input validation in Mozilla Firefox

Priority LOW 26CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

A spoofing vulnerability can occur when a page switches to fullscreen mode without user notification, allowing a fake address bar to be displayed. This allows an attacker to spoof which page is actually loaded and in use. Note: This attack only affects Firefox for Android. Other operating systems are not affected. This vulnerability affects Firefox < 56.

Why it matters now

EPSS 0.01139 66th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Firefox (Mozilla): 56

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 5656Patch availableCNA
  • Firefox VendorMozilla Affected before 56 Fixed in 56 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*up to 55.0.3VulnerableMozilla
cpe:2.3:o:google:android:*:*:*:*:*:*:*:*all versionsRunning onGoogle
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions up to 55.0.3 Vulnerable ·Mozilla
  • cpe:2.3:o:google:android:*:*:*:*:*:*:*:* Versions all versions Running on ·Google

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 56

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 56

    9 records Highest priority Priority MEDIUM 2 MEDIUM, 7 LOW

    Other records, highest priority first

    • TI-2017-05438 Incorrect permission assignment in Mozilla FirefoxPriority MEDIUM 46
    • TI-2017-05428 Memory corruption in Mozilla FirefoxPriority MEDIUM 46
    • TI-2017-05430 Out-of-bounds read in Mozilla FirefoxPriority LOW 39
    Show all 9 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-7817
  2. 2026-10-03 Alias added: GHSA-9f34-96p5-45qg

References

Exploit 1

Advisory 1

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences