Is CVE-2018-18505 being actively exploited?

CVE-2018-18505 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2018-18505?

CVE-2018-18505 has a CVSS 3.0 base score of 10.0 (CRITICAL).

CVE-2018-18505

CRITICAL · CVSS 10.0EPSS 4.4%EU EUVD

An earlier fix for an Inter-process Communication (IPC) vulnerability, CVE-2011-3079, added authentication to communication between IPC endpoints and server parents during IPC process creation. This authentication is insufficient for channels created after the IPC process is started, leading to the authentication not being correctly applied to later channels. This could allow for a sandbox escape through IPC channels due to lack of message validation in the listener process. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.

Key facts

CVSS score: 10.0 (v3.0)
Severity: CRITICAL
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-287
EPSS score: 4.4% (91th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2018-10230)
Published: February 5, 2019
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2018-10230 in the EU Vulnerability Database. Last updated in EUVD on August 5, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
mozilla / firefox
mozilla / thunderbird
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server eus
redhat / enterprise linux server tus
redhat / enterprise linux workstation
redhat / enterprise linux workstation

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 7.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11039-2020 - archived

References

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
http://www.securityfocus.com/bid/106781(Third Party Advisory, VDB Entry)
https://access.redhat.com/errata/RHSA-2019:0218(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0219(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0269(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0270(Third Party Advisory)
https://bugzilla.mozilla.org/show_bug.cgi?id=1087565(Issue Tracking, Patch, Vendor Advisory)
https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html(Mailing List, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html(Mailing List, Third Party Advisory)
https://security.gentoo.org/glsa/201903-04(Third Party Advisory)
https://security.gentoo.org/glsa/201904-07(Third Party Advisory)
https://usn.ubuntu.com/3874-1/(Third Party Advisory)
https://usn.ubuntu.com/3897-1/(Third Party Advisory)
https://www.debian.org/security/2019/dsa-4376(Third Party Advisory)
https://www.debian.org/security/2019/dsa-4392(Third Party Advisory)
https://www.mozilla.org/security/advisories/mfsa2019-01/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2019-02/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2019-03/(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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