synced 3 MIN AGO
01 Record

CVE-2021-30666

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware

HighKEVPUBLISHEDCNA: apple
CNA base score8.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
View raw JSON

02 Description

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware

03 Exploitation and scoring

Exploitation
Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2021-11-03. Federal remediation due 2021-11-17.
SSVC decision
  • ExploitationactiveCISA reports credible evidence of active exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.99% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 86.8% of scored records. A rank, not a probability.
NVD base score
8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-09-08 14:25Z5 YR AGO
Last updated
2025-10-21 23:25Z1 YR AGO
Reserved
2021-04-13
Assigning CNA
apple
Record state
PUBLISHED
Severity
High (CVSS 8.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
  • CWE-20Improper Input ValidationClass
Data version
5.1
Document digest
72f973f011ca35c0a3c6ce6b1cc31b38e24556773e47fb4159660186930c8dc2

05 Affected products

VendorProductVersionsPlatforms
AppleiOS< 12.5—

06 References

07 Fixed in

AlmaLinux 8

  • LibRaw-devel
    Fixed in 0.19.5-2.el8
  • PackageKit
    Fixed in 1.1.12-6.el8
  • PackageKit-command-not-found
    Fixed in 1.1.12-6.el8
  • PackageKit-cron
    Fixed in 1.1.12-6.el8
  • PackageKit-glib
    Fixed in 1.1.12-6.el8
  • PackageKit-glib-devel
    Fixed in 1.1.12-6.el8
  • PackageKit-gstreamer-plugin
    Fixed in 1.1.12-6.el8
  • PackageKit-gtk3-module
    Fixed in 1.1.12-6.el8
  • dleyna-renderer
    Fixed in 0.6.0-3.el8
  • frei0r-devel
    Fixed in 1.6.1-7.el8
  • frei0r-plugins
    Fixed in 1.6.1-7.el8
  • frei0r-plugins-opencv
    Fixed in 1.6.1-7.el8
  • gnome-remote-desktop
    Fixed in 0.1.8-3.el8
  • gtk-doc
    Fixed in 1.28-2.el8
  • gvfs
    Fixed in 1.36.2-10.el8
  • libsoup
    Fixed in 2.62.3-2.el8
  • libsoup-devel
    Fixed in 2.62.3-2.el8
  • mutter-devel
    Fixed in 3.32.2-48.el8
  • nautilus
    Fixed in 3.28.1-14.el8
  • nautilus-devel
    Fixed in 3.28.1-14.el8
  • pipewire
    Fixed in 0.3.6-1.el8
  • pipewire-devel
    Fixed in 0.3.6-1.el8
  • pipewire-doc
    Fixed in 0.3.6-1.el8
  • pipewire-libs
    Fixed in 0.3.6-1.el8
  • pipewire-utils
    Fixed in 0.3.6-1.el8
  • pipewire0.2-devel
    Fixed in 0.2.7-6.el8
  • pipewire0.2-libs
    Fixed in 0.2.7-6.el8
  • potrace
    Fixed in 1.15-3.el8
  • pygobject3-devel
    Fixed in 3.28.3-2.el8
  • python3-gobject
    Fixed in 3.28.3-2.el8
  • python3-gobject-base
    Fixed in 3.28.3-2.el8
  • tracker
    Fixed in 2.1.5-2.el8
  • tracker-devel
    Fixed in 2.1.5-2.el8
  • vte-profile
    Fixed in 0.52.4-2.el8
  • vte291
    Fixed in 0.52.4-2.el8
  • vte291-devel
    Fixed in 0.52.4-2.el8
  • webrtc-audio-processing
    Fixed in 0.3-9.el8
  • xdg-desktop-portal-gtk
    Fixed in 1.6.0-1.el8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • wpewebkit
    Not affected

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • LibRaw-devel
    Fixed in 0.19.5-2.el8
  • PackageKit
    Fixed in 1.1.12-6.el8
  • PackageKit-command-not-found
    Fixed in 1.1.12-6.el8
  • PackageKit-cron
    Fixed in 1.1.12-6.el8
  • PackageKit-glib
    Fixed in 1.1.12-6.el8
  • PackageKit-glib-devel
    Fixed in 1.1.12-6.el8
  • PackageKit-gstreamer-plugin
    Fixed in 1.1.12-6.el8
  • PackageKit-gtk3-module
    Fixed in 1.1.12-6.el8
  • dleyna-renderer
    Fixed in 0.6.0-3.el8
  • frei0r-devel
    Fixed in 1.6.1-7.el8
  • frei0r-plugins
    Fixed in 1.6.1-7.el8
  • frei0r-plugins-opencv
    Fixed in 1.6.1-7.el8
  • gnome-remote-desktop
    Fixed in 0.1.8-3.el8
  • gtk-doc
    Fixed in 1.28-2.el8
  • gvfs
    Fixed in 1.36.2-10.el8
  • libsoup
    Fixed in 2.62.3-2.el8
  • libsoup-devel
    Fixed in 2.62.3-2.el8
  • mutter-devel
    Fixed in 3.32.2-48.el8
  • nautilus
    Fixed in 3.28.1-14.el8
  • nautilus-devel
    Fixed in 3.28.1-14.el8
  • pipewire
    Fixed in 0.3.6-1.el8
  • pipewire-devel
    Fixed in 0.3.6-1.el8
  • pipewire-doc
    Fixed in 0.3.6-1.el8
  • pipewire-libs
    Fixed in 0.3.6-1.el8
  • pipewire-utils
    Fixed in 0.3.6-1.el8
  • pipewire0.2-devel
    Fixed in 0.2.7-6.el8
  • pipewire0.2-libs
    Fixed in 0.2.7-6.el8
  • potrace
    Fixed in 1.15-3.el8
  • pygobject3-devel
    Fixed in 3.28.3-2.el8
  • python3-gobject
    Fixed in 3.28.3-2.el8
  • python3-gobject-base
    Fixed in 3.28.3-2.el8
  • tracker
    Fixed in 2.1.5-2.el8
  • tracker-devel
    Fixed in 2.1.5-2.el8
  • vte-profile
    Fixed in 0.52.4-2.el8
  • vte291
    Fixed in 0.52.4-2.el8
  • vte291-devel
    Fixed in 0.52.4-2.el8
  • webrtc-audio-processing
    Fixed in 0.3-9.el8
  • xdg-desktop-portal-gtk
    Fixed in 1.6.0-1.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • webkit2gtk
    Fixed in 2.26.1-2
  • wpewebkit
    Fixed in 2.26.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • webkit2gtk
    Fixed in 2.26.1-2
  • wpewebkit
    Fixed in 2.26.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • webkit2gtk
    Fixed in 2.26.1-2
  • wpewebkit
    Fixed in 2.26.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • qtwebkit-opensource-src
    No fix yet
  • qtwebkit-source
    No fix yet
  • webkit2gtk
    No fix yet
  • webkitgtk
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • qtwebkit-opensource-src
    No fix yet
  • qtwebkit-source
    No fix yet
  • webkit2gtk
    Fixed in 2.26.1-0ubuntu0.18.04.1
  • webkitgtk
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • qtwebkit-opensource-src
    No fix yet
  • wpewebkit
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • qtwebkit-opensource-src
    No fix yet
  • wpewebkit
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • qtwebkit-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.