PT-2020-6243 · Apple+7 · Webkitgtk+7

Icewall + 1 · Published 2020-12-10 · Updated 2024-06-15 · CVE-2021-21806

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions WebKitGTK version 2.30.3

Description A use-after-free vulnerability exists in the WebKitGTK browser, allowing remote code execution when a victim visits a malicious web site. The issue is triggered by a specially crafted HTML web page, causing a use-after-free condition.

Recommendations For WebKitGTK version 2.30.3, update to a newer version that contains a fix for this issue. As a temporary workaround, consider restricting access to potentially malicious web sites to minimize the risk of exploitation.

Exploit

Fix

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALSA-2021:4381

ALT-PU-2020-3512

BDU:2021-03689

CESA-2021_4381

CVE-2021-21806

DSA-4877-1

OPENSUSE-SU-2021:1369-1

OPENSUSE-SU-2021:3353-1

OPENSUSE-SU-2021_1369-1

OPENSUSE-SU-2021_3353-1

OPENSUSE-SU-2024:11506-1

RHSA-2021:4381

RHSA-2021_4381

RHSA-2025:10364

RLSA-2021:4381

SUSE-SU-2021:3282-1

SUSE-SU-2021:3296-1

SUSE-SU-2021:3353-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Red Hat

Rocky Linux

Suse

Webkitgtk

References · 261

• 🔥❌ https://github.com/PeterMxx/ps4_8.00_vuln_poc · Exploit, Deleted
• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2020-1214 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-21806 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4877-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21806 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2024:11506-1 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2021:4381 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03689 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2022-0114SE47 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:3282-1 · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2021-4381.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-4381.html · Vendor Advisory
• https://osv.dev/vulnerability/RLSA-2021:4381 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-21806 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-21806 · Vendor Advisory