CVE-2021-1748

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-02 · updated 2026-06-17
Weakness: CWE-20

Description

A validation issue was addressed with improved input sanitization. This issue is fixed in tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4. Processing a maliciously crafted URL may lead to arbitrary javascript code execution.

Affected products

Apple iPadOS: before 14.4 — fixed in 14.4
Apple Iphone Os: before 14.4 — fixed in 14.4
Apple tvOS: before 14.4 — fixed in 14.4
Apple watchOS: before 7.3 — fixed in 7.3

How to fix

Upgrade to a fixed version: Apple iPadOS 14.4; Apple Iphone Os 14.4; Apple tvOS 14.4; Apple watchOS 7.3. Check the vendor advisory for mitigations.

References

https://support.apple.com/en-us/HT212146
https://support.apple.com/en-us/HT212148
https://support.apple.com/en-us/HT212149
https://support.apple.com/en-us/HT212146
https://support.apple.com/en-us/HT212148
https://support.apple.com/en-us/HT212149

Get alerted when CVE-2021-1748 or the next vulnerability affects your stack