CVE-2021-30851

webkitgtk: Memory corruption issue leading to arbitrary code execution

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in Safari 15, tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing maliciously crafted web content may lead to code execution.

Se abordó una vulnerabilidad de corrupción de memoria con un bloqueo mejorado. Este problema se corrigió en Safari versión 15, tvOS versión 15, watchOS versión 8, iOS versión 15 y iPadOS versión 15. El procesamiento de contenido web diseñado de forma maliciosa puede conllevar a una ejecución de código

An update that fixes two vulnerabilities is now available. This update for webkit2gtk3 fixes the following issues. Fixed memory corruption issue that could lead to arbitrary code execution when processing maliciously crafted web content. Fixed memory corruption vulnerability that could lead to arbitrary code execution when processing maliciously crafted web content. This update was imported from the SUSE:SLE-15-SP2:Update update project.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-13 CVE Reserved
2021-08-24 CVE Published
2024-08-03 CVE Updated
2025-07-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (12)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2021/10/31/1	Mailing List
https://support.apple.com/en-us/HT212814	X_refsource_misc
https://support.apple.com/en-us/HT212815	X_refsource_misc
https://support.apple.com/en-us/HT212816	X_refsource_misc
https://support.apple.com/en-us/HT212819	X_refsource_misc
https://support.apple.com/kb/HT212869	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H6MGXCX7P5AHWOQ6IRT477UKT7IS4DAD	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ON5SDVVPVPCAGFPW2GHYATZVZYLPW2L4	2023-11-07
https://www.debian.org/security/2021/dsa-4995	2023-11-07
https://www.debian.org/security/2021/dsa-4996	2023-11-07
https://access.redhat.com/security/cve/CVE-2021-30851	2025-07-07
https://bugzilla.redhat.com/show_bug.cgi?id=2018573	2025-07-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apple Search vendor "Apple"		Safari Search vendor "Apple" for product "Safari"				< 15.0 Search vendor "Apple" for product "Safari" and version " < 15.0"		-		Affected
Apple Search vendor "Apple"		Ipados Search vendor "Apple" for product "Ipados"				< 15.0 Search vendor "Apple" for product "Ipados" and version " < 15.0"		-		Affected
Apple Search vendor "Apple"		Iphone Os Search vendor "Apple" for product "Iphone Os"				< 15.0 Search vendor "Apple" for product "Iphone Os" and version " < 15.0"		-		Affected
Apple Search vendor "Apple"		Macos Search vendor "Apple" for product "Macos"				< 12.0.1 Search vendor "Apple" for product "Macos" and version " < 12.0.1"		-		Affected
Apple Search vendor "Apple"		Macos Search vendor "Apple" for product "Macos"				12.0.1 Search vendor "Apple" for product "Macos" and version "12.0.1"		-		Affected
Apple Search vendor "Apple"		Tvos Search vendor "Apple" for product "Tvos"				< 15.0 Search vendor "Apple" for product "Tvos" and version " < 15.0"		-		Affected
Apple Search vendor "Apple"		Watchos Search vendor "Apple" for product "Watchos"				< 8.0 Search vendor "Apple" for product "Watchos" and version " < 8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected