CVE-2021-30836

webkitgtk: Out-of-bounds read leading to memory disclosure

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 14.8 and iPadOS 14.8, tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing a maliciously crafted audio file may disclose restricted memory.

Se abordó una lectura fuera de límites con una comprobación de entrada mejorada. Este problema se corrigió en iOS versión 14.8 y iPadOS versión 14.8, tvOS versión 15, watchOS versión 8, iOS versión 15 y iPadOS versión 15. El procesamiento de un archivo de audio diseñado de forma maliciosa puede revelar la memoria restringida

An out-of-bounds read flaw was found in WebKitGTK. A specially crafted audio file could use this flaw to trigger a disclosure of memory when processed.

An update that fixes 43 vulnerabilities is now available. This update for webkit2gtk3 fixes the following issues. Fixed logic issue allowing unexpectedly unenforced Content Security Policy when processing maliciously crafted web content. Fixed logic issue allowing universal cross site scripting when processing maliciously crafted web content.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-13 CVE Reserved
2021-10-28 CVE Published
2024-08-03 CVE Updated
2025-07-28 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (9)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2021/12/20/6	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://support.apple.com/en-us/HT212807	2021-12-21
https://support.apple.com/en-us/HT212814	2021-12-21
https://support.apple.com/en-us/HT212815	2021-12-21
https://support.apple.com/en-us/HT212819	2021-12-21
https://support.apple.com/kb/HT212816	2021-12-21
https://support.apple.com/kb/HT212869	2021-12-21
https://access.redhat.com/security/cve/CVE-2021-30836	2025-07-07
https://bugzilla.redhat.com/show_bug.cgi?id=2034376	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"				< 15.0.0 Search vendor "Apple" for product "Safari" and version " < 15.0.0"		-		Affected
Apple Search vendor "Apple"		Ipados Search vendor "Apple" for product "Ipados"				< 14.8 Search vendor "Apple" for product "Ipados" and version " < 14.8"		-		Affected
Apple Search vendor "Apple"		Iphone Os Search vendor "Apple" for product "Iphone Os"				< 14.8 Search vendor "Apple" for product "Iphone Os" and version " < 14.8"		-		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