CVE-2021-1788

Name: CVE-2021-1788
Creator: NVD / NIST
Published: 2021-04-02T18:15:21.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.60%

Last modified Jun 17, 2026

CVE-2021-1788 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. EPSS estimates a 1.60% chance of exploitation in the next 30 days.

Description

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.60%

72.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.4
Apple	Iphone Os	< 14.4
Apple	Mac Os X	>= 10.14, < 10.14.6
Apple	Mac Os X	>= 10.15, < 10.15.7
Apple	Mac Os X	10.14.6
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.2
Apple	Safari	< 14.0.3
Apple	Tvos	< 14.4
Apple	Watchos	< 7.3
Debian	Debian Linux	10.0
Fedoraproject	Fedora	33

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
https://support.apple.com/en-us/HT212146Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212147Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212148Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212149Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212152Release Notes, Vendor Advisory
https://www.debian.org/security/2021/dsa-4923Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
https://support.apple.com/en-us/HT212146Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212147Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212148Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212149Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212152Release Notes, Vendor Advisory
https://www.debian.org/security/2021/dsa-4923Third Party Advisory

Timeline

Published: Apr 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1788?

How severe is CVE-2021-1788?

CVE-2021-1788 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1788?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1788?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST