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TI-2018-13090 Aliases CVE-2018-18506GHSA-4gc3-hqxg-hgp9

When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration…

Priority LOW 31Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.

Why it matters now

EPSS 0.02196 82nd percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 65Red Hat: 6 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 6565Patch availableCNA
  • Firefox VendorMozilla Affected before 65 Fixed in 65 Patch available CNA

CPE configurations NVD · 29

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 65.0VulnerableMozilla
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:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
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 65.0 Vulnerable ·Mozilla
  • 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: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:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • 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 19 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*8.1VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
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_aus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:*8.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*8.4VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*8.6VulnerableRed 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:opensuse:leap:15.0:*:*:*:*:*:*:*15.0VulnerableopenSUSE
cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:*42.3VulnerableopenSUSE
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red 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_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:* Versions 8.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* Versions 8.4 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:* Versions 8.6 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
  • cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·openSUSE
  • cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:* Versions 42.3 Vulnerable ·openSUSE

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 65

Red Hat 6 advisories

  • RHSA-2019:1144 Released 2019-05-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-60.6.1-1.el8
  • RHSA-2019:0966 Released 2019-05-07 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-60.6.1-1.el8
  • RHSA-2019:0681 Released 2019-03-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
Show 3 more Red Hat advisories
  • RHSA-2019:0680 Released 2019-03-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.6.1-1.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.6.1-1.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.6.1-1.el6_10
  • RHSA-2019:0623 Released 2019-03-20 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Server (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-60.6.0-3.el6_10
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.6.0-3.el6_10
  • RHSA-2019:0622 Released 2019-03-20 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Server (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.6.0-3.el7_6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.6.0-3.el7_6

Fixed in the same release

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

  • Advisory ·

    Mozilla Firefox — USN-3874-1

    5 records Highest priority Priority MEDIUM 4 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2018-13089 Improper authentication in Mozilla ThunderbirdPriority MEDIUM 50
    • TI-2018-13085 Memory corruption in Mozilla ThunderbirdPriority MEDIUM 48
    • TI-2018-13086 Memory corruption in Mozilla FirefoxPriority MEDIUM 46
    Show all 5 records → Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2019:0966, RHSA-2019:1144
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:0622, RHSA-2019:0681
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2019:0623, RHSA-2019:0680
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2019:0623, RHSA-2019:0680
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:0622, RHSA-2019:0681
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2019:0623, RHSA-2019:0680
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0622, RHSA-2019:0681
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2019:0623
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2019:0622
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:0681

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-18506
  2. 2026-10-03 Alias added: GHSA-4gc3-hqxg-hgp9

References

Advisory 20

  • 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