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Fencer Intel
high 8.8

CVE-2021-1817 json

A memory corruption issue was addressed with improved state management.

published 5y ago modified 4mo ago also EUVD-2021-7281

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to arbitrary code execution.

Patch / fix

  • Apple iOS and iPadOS 14.5
  • Apple tvOS 14.5
  • Apple watchOS 7.4
  • Apple macOS 11.3
  • wpewebkit Debian 14, Debian 13, Debian 12 2.30.0-1
  • webkit2gtk Debian 14, Debian 13, Debian 12 2.30.1-1

debian advisories DEBIAN-CVE-2021-1817

  • webkit2gtk Ubuntu 18.04 LTS 2.30.3-0ubuntu0.18.04.1
  • webkit2gtk Ubuntu 20.04 LTS 2.30.3-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2021-1817

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

  • gdm RHEL 8 1:3.28.3-39.el8
  • glib2 RHEL 8 2.56.4-9.el8
  • glib2-fam RHEL 8 2.56.4-9.el8
  • glib2-tests RHEL 8 2.56.4-9.el8
  • webkit2gtk3 RHEL 8 2.30.4-1.el8
  • webkit2gtk3-jsc RHEL 8 2.30.4-1.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-2021:1586

  • 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

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

  • gtk3 openSUSE Tumbleweed 2.32.4-1.1
  • webkit2gtk3 openSUSE Leap 15.3 2.34.3-23.3

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

  • gjs AlmaLinux 8 1.56.2-5.el8
  • gtk2 AlmaLinux 8 2.24.32-5.el8
  • gvfs AlmaLinux 8 1.36.2-11.el8
  • vala AlmaLinux 8 0.40.19-2.el8
  • atkmm AlmaLinux 8 2.24.2-7.el8
  • gamin AlmaLinux 8 0.1.10-32.el8
  • woff2 AlmaLinux 8 1.0.2-5.el8
  • cairomm AlmaLinux 8 1.12.0-8.el8

almalinux advisories ALSA-2021:1586

  • gdm Rocky Linux 8 1:3.28.3-39.el8
  • gjs Rocky Linux 8 1.56.2-5.el8
  • gtk2 Rocky Linux 8 2.24.32-5.el8
  • gvfs Rocky Linux 8 1.36.2-11.el8
  • vala Rocky Linux 8 0.40.19-2.el8
  • atkmm Rocky Linux 8 2.24.2-7.el8
  • gamin Rocky Linux 8 0.1.10-32.el8
  • woff2 Rocky Linux 8 1.0.2-5.el8

rocky linux advisories RLSA-2021:1586

  • webkit2gtk Alpine 3.20, Alpine 3.19, Alpine 3.18 +4 more 2.30.0-r0

alpine advisories ALPINE-CVE-2021-1817

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

Is CVE-2021-1817 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2021-1817 updated cvss 8.8

webkitgtk: Memory corruption 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 2.30.4-1.el8, webkit2gtk3-jsc 2.30.4-1.el8
    fixed: vendor fix RHSA-2021:1586
  • 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) gvfs 1.36.2-11.el8, vala 0.40.19-2.el8, libsass 3.4.5-6.el8, libdazzle 3.28.5-2.el8, libepubgen 0.1.0-3.el8, nautilus 3.28.1-15.el8 Red Hat Enterprise Linux 9 webkit2gtk3, webkit2gtk3-jsc Red Hat Enterprise Linux AppStream (v. 8) gjs 1.56.2-5.el8, gdm 3.28.3-39.el8, woff2 1.0.2-5.el8, atkmm 2.24.2-7.el8, gtk2 2.24.32-5.el8, gvfs 1.36.2-11.el8, +71 more Red Hat Enterprise Linux BaseOS (v. 8) glib2 2.56.4-9.el8, gamin 0.1.10-32.el8, glib2-fam 2.56.4-9.el8, glib2-tests 2.56.4-9.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

1.94% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/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 iOS and iPadOS
  • Apple tvOS
  • Apple watchOS
  • Apple macOS

Classification

Weakness

References

Sources

Fencer Intel 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.