CVE-2021-1747

moderate-risk

Published 2021-04-02

An out-of-bounds write was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. Processing maliciously crafted web content may lead to code execution.

Do I need to act?

0.78% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.8/10 High

LOCAL / LOW complexity

Affected Products (20)

Ipados

Iphone Os

Mac Os X

Macos

Affected Vendors

Apple

References (8)

Release Notes https://support.apple.com/en-us/HT212146

Release Notes https://support.apple.com/en-us/HT212147

Release Notes https://support.apple.com/en-us/HT212148

Release Notes https://support.apple.com/en-us/HT212149

Release Notes https://support.apple.com/en-us/HT212146

Release Notes https://support.apple.com/en-us/HT212147

Release Notes https://support.apple.com/en-us/HT212148

Release Notes https://support.apple.com/en-us/HT212149

/ 100

moderate-risk

Severity 24/34 · High

Exploitability 3/34 · Minimal

Exposure 20/34 · Moderate