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TI-2018-08894 Aliases CVE-2018-12395GHSA-vw7x-c78h-8w2r

By rewriting the Host: request headers using the webRequest API, a WebExtension can…

Priority LOW 38Published · Updated

Key facts

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

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.

Summary

By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

Why it matters now

EPSS 0.02851 86th percentileScored 2026-11-07
Fix Fixed Firefox ESR (Mozilla): 60.3Firefox (Mozilla): 63Red Hat: 2 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox ESRbefore 60.360.3Patch availableCNA
MozillaFirefoxbefore 6363Patch availableCNA
  • Firefox ESR VendorMozilla Affected before 60.3 Fixed in 60.3 Patch available CNA
  • Firefox VendorMozilla Affected before 63 Fixed in 63 Patch available CNA

CPE configurations NVD · 15

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 63.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 60.3VulnerableMozilla
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 63.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 60.3 Vulnerable ·Mozilla
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
  • cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Show 5 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*7.5VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:* Versions 7.5 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA Firefox ESR (Mozilla) Fixed in 60.3
  • Fix · CNA Firefox (Mozilla) Fixed in 63

Red Hat 2 advisories

  • RHSA-2018:3006 Released 2018-10-24 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-60.3.0-1.el6
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.3.0-1.el6
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.3.0-1.el6
    • Red Hat Enterprise Linux Server (v. 6) firefox-60.3.0-1.el6
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.3.0-1.el6
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-60.3.0-1.el6
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.3.0-1.el6
  • RHSA-2018:3005 Released 2018-10-24 · Red Hat rating Critical
    firefox security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) firefox-60.3.0-1.el7_5
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.3.0-1.el7_5
    • Red Hat Enterprise Linux Server (v. 7) firefox-60.3.0-1.el7_5
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.3.0-1.el7_5
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-60.3.0-1.el7_5
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.3.0-1.el7_5
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.3.0-1.el7_5

Fixed in the same release

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

  • Advisory ·

    Mozilla Firefox, Firefox ESR — USN-3801-1

    12 records Highest priority Priority MEDIUM 4 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2018-08892 When manipulating user events in nested loops while opening a document through script, it…Priority MEDIUM 48
    • TI-2018-08890 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
    • TI-2018-08888 Memory corruption in Mozilla FirefoxPriority MEDIUM 41
    Show all 12 records → Advisory →
  • Advisory ·

    Mozilla Firefox, Firefox ESR — RHSA-2018:3005

    7 records Highest priority Priority MEDIUM 4 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2018-08892 When manipulating user events in nested loops while opening a document through script, it…Priority MEDIUM 48
    • TI-2018-08890 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
    • TI-2018-08889 Memory corruption in Mozilla Firefox ESRPriority MEDIUM 43
    Show all 7 records → Advisory →
Show 3 more groups
  • Advisory ·

    Mozilla Firefox, Firefox ESR — RHSA-2018:3006

    7 records Highest priority Priority MEDIUM 4 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2018-08892 When manipulating user events in nested loops while opening a document through script, it…Priority MEDIUM 48
    • TI-2018-08890 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
    • TI-2018-08889 Memory corruption in Mozilla Firefox ESRPriority MEDIUM 43
    Show all 7 records → Advisory →
  • Advisory ·

    Mozilla Firefox, Firefox ESR — GLSA-201811-04

    7 records Highest priority Priority MEDIUM 4 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2018-08892 When manipulating user events in nested loops while opening a document through script, it…Priority MEDIUM 48
    • TI-2018-08890 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
    • TI-2018-08889 Memory corruption in Mozilla Firefox ESRPriority MEDIUM 43
    Show all 7 records → Advisory →
  • Advisory ·

    Mozilla Firefox, Firefox ESR — DSA-4324

    7 records Highest priority Priority MEDIUM 4 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2018-08892 When manipulating user events in nested loops while opening a document through script, it…Priority MEDIUM 48
    • TI-2018-08890 Memory corruption in Mozilla FirefoxPriority MEDIUM 48
    • TI-2018-08889 Memory corruption in Mozilla Firefox ESRPriority MEDIUM 43
    Show all 7 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2018:3005
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2018:3005
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2018:3005
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2018:3005
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2018:3005
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2018:3006
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2018:3005
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2018:3005
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-12395
  2. 2026-10-03 Alias added: GHSA-vw7x-c78h-8w2r

References

Advisory 9

  • 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