CVE-2018-12365

CVE-2018-12365 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

• Severity: Medium (CVSS 3.x base score 6.5)
• CVSS v2: 4.3
• EPSS exploit prediction: 3% (86th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-200
• Affected product: Mozilla Firefox
• Published: 2018-10-18
• Last modified: 2026-06-17

Description

A compromised IPC child process can escape the content sandbox and list the names of arbitrary files on the file system without user consent or interaction. This could result in exposure of private local files. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

Frequently asked questions

What is CVE-2018-12365?

A compromised IPC child process can escape the content sandbox and list the names of arbitrary files on the file system without user consent or interaction. This could result in exposure of private local files. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

How severe is CVE-2018-12365?

CVE-2018-12365 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-12365 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-12365?

CVE-2018-12365 primarily affects Mozilla Firefox. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-12365?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-12365 published?

CVE-2018-12365 was published on 2018-10-18 and last updated on 2026-06-17.

References

• http://www.securityfocus.com/bid/104560
• http://www.securitytracker.com/id/1041193
• https://access.redhat.com/errata/RHSA-2018:2112
• https://access.redhat.com/errata/RHSA-2018:2113
• https://access.redhat.com/errata/RHSA-2018:2251
• https://access.redhat.com/errata/RHSA-2018:2252
• https://bugzilla.mozilla.org/show_bug.cgi?id=1459206
• https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
• https://lists.debian.org/debian-lts-announce/2018/07/msg00013.html
• https://security.gentoo.org/glsa/201810-01
• https://security.gentoo.org/glsa/201811-13
• https://usn.ubuntu.com/3705-1/
• https://usn.ubuntu.com/3714-1/
• https://www.debian.org/security/2018/dsa-4235
• https://www.debian.org/security/2018/dsa-4244
• https://www.mozilla.org/security/advisories/mfsa2018-15/
• https://www.mozilla.org/security/advisories/mfsa2018-16/
• https://www.mozilla.org/security/advisories/mfsa2018-17/
• https://www.mozilla.org/security/advisories/mfsa2018-18/
• https://www.mozilla.org/security/advisories/mfsa2018-19/

Affected products (19)

• cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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