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Fencer Vulns
high 7.8

CVE-2020-27918 json

A use after free issue was addressed with improved memory management.

published 2020-12-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20411

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

Patch / fix

  • Apple watchOS 7.1
  • Apple iOS and iPadOS 14.2
  • Apple tvOS 14.2
  • Apple macOS 11.0, 11.5, 12.11, 14.0
  • wpewebkit Debian 14, Debian 13, Debian 12 2.30.6-1
  • webkit2gtk Debian 14, Debian 13, Debian 12 2.30.6-1

debian advisories DEBIAN-CVE-2020-27918

  • webkit2gtk Ubuntu 18.04 LTS 2.30.6-0ubuntu0.18.04.1
  • webkit2gtk Ubuntu 20.04 LTS 2.30.6-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-27918

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • LibRaw RHEL 8 0.19.5-3.el8
  • webkit2gtk3 RHEL 8 2.32.3-2.el8
  • gnome-autoar RHEL 8 0.2.3-2.el8
  • webkit2gtk3-jsc RHEL 8 2.32.3-2.el8
  • webkitgtk4 RHEL 7 ELS 2.48.3-2.el7_9
  • webkitgtk4-jsc RHEL 7 ELS 2.48.3-2.el7_9

red hat advisories RHSA-2025:10364RHSA-2021:4381

  • webkit2gtk3 SLES 15 SP2-BCL, SLE Real Time 15 SP2, SLE Module for Desktop Applications 15 SP3 +9 more 2.34.3-23.3
  • webkit2gtk3 SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 2.34.3-3.92.1
  • webkit2gtk3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 2.34.3-2.82.1
  • webkit2gtk3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 2.32.1-2.63.3
  • webkit2gtk3 SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +10 more 2.32.0-3.74.1
  • webkit2gtk3 SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP2 2.32.0-3.15.1

suse advisories SUSE-SU-2022:0182-2SUSE-SU-2022:0183-1SUSE-SU-2022:0182-1SUSE-SU-2022:0142-1SUSE-SU-2021:1990-1SUSE-SU-2021:1499-1

  • gtk3 openSUSE Tumbleweed 2.32.4-1.1
  • webkit2gtk3 openSUSE Leap 15.3 2.34.3-23.3
  • webkit2gtk3 openSUSE Leap 15.2 2.32.0-lp152.2.13.1

opensuse advisories openSUSE-SU-2024:11506-1openSUSE-SU-2022:0182-1openSUSE-SU-2021:0637-1

  • gdm AlmaLinux 8 1:40.0-15.el8
  • gtk3 AlmaLinux 8 3.22.30-8.el8
  • vino AlmaLinux 8 3.22.0-11.el8
  • LibRaw AlmaLinux 8 0.19.5-3.el8
  • mutter AlmaLinux 8 3.32.2-60.el8
  • gnome-shell AlmaLinux 8 3.32.2-40.el8
  • webkit2gtk3 AlmaLinux 8 2.32.3-2.el8
  • gnome-autoar AlmaLinux 8 0.2.3-2.el8

almalinux advisories ALSA-2021:4381

  • gdm Rocky Linux 8 1:40.0-15.el8
  • gtk3 Rocky Linux 8 3.22.30-8.el8
  • vino Rocky Linux 8 3.22.0-11.el8
  • LibRaw Rocky Linux 8 0.19.5-3.el8
  • mutter Rocky Linux 8 3.32.2-60.el8
  • gnome-shell Rocky Linux 8 3.32.2-40.el8
  • webkit2gtk3 Rocky Linux 8 2.32.3-2.el8
  • gnome-autoar Rocky Linux 8 0.2.3-2.el8

rocky linux advisories RLSA-2021:4381

  • webkit2gtk Alpine 3.20, Alpine 3.19, Alpine 3.18 +5 more 2.30.6-r0

alpine advisories ALPINE-CVE-2020-27918

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • wpewebkit Arch Linux 2.30.6-1

arch linux advisories AVG-1722

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27918 updated cvss 7.8

webkitgtk: Use-after-free leading to arbitrary code execution

  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.32.3-2.el8, webkit2gtk3-jsc 2.32.3-2.el8
    fixed: vendor fix RHSA-2021:4381
  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.48.3-2.el7_9, webkitgtk4-jsc 2.48.3-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.48.3-2.el7_9, webkitgtk4-devel 2.48.3-2.el7_9, webkitgtk4-debuginfo 2.48.3-2.el7_9, webkitgtk4-jsc-devel 2.48.3-2.el7_9
    fixed: vendor fix RHSA-2025:10364
  • Red Hat CodeReady Linux Builder (v. 8) gnome-software 3.36.1-10.el8 Red Hat Enterprise Linux 9 webkit2gtk3, webkit2gtk3-jsc Red Hat Enterprise Linux AppStream (v. 8) gdm 40.0-15.el8, gtk3 3.22.30-8.el8, vino 3.22.0-11.el8, LibRaw 0.19.5-3.el8, mutter 3.32.2-60.el8, gnome-autoar 0.2.3-2.el8, +41 more Red Hat Enterprise Linux BaseOS (v. 8) gsettings-desktop-schemas 3.32.0-6.el8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Apple watchOS
  • Apple iOS and iPadOS
  • Apple tvOS
  • Apple macOS

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.