CVE-2021-30665 | BDVDB-2026-160385 Detail

ApplemacOS

Description#

A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-787 Out-of-bounds Write

References#

Exploit#

No public exploit known

History#

Version 12021-09-08Record published in the CVE List.
Version 22025-10-21Most recent update recorded in the CVE List.

Published

Published: 2021-09-08
Last modified: 2025-10-21

Vendor information

Vendor: Apple
Product: macOS

All Apple vulnerabilities

Score

8.8 High

EPSS

3.7%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 89.8.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

Apply updates per vendor instructions.

Affected Systems

Vulnerable
< 11.3
Fixed
11.3
Vulnerable
< 14.5
Fixed
14.5
Vulnerable
< 7.4
Fixed
7.4
Vulnerable
< 12.5
Fixed
12.5
Vulnerable
< 14.6
Fixed
14.6

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.8 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).