CVE-2021-30805

Name: CVE-2021-30805
Creator: NVD / NIST
Published: 2021-09-08T14:15:11.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.05%

Last modified Jun 17, 2026

CVE-2021-30805 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. EPSS estimates a 3.05% chance of exploitation in the next 30 days.

Description

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. An application may be able to execute arbitrary code with kernel privileges.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.05%

85.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions	Update
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	Security Update 2019-001
Apple	Mac Os X	10.15.6	Supplemental Update
Apple	Mac Os X	10.15.7	Security Update 2020
Apple	Macos	>= 11.0, < 11.5	—

References

https://support.apple.com/en-us/HT212600Vendor Advisory
https://support.apple.com/en-us/HT212602Vendor Advisory
https://support.apple.com/en-us/HT212603Vendor Advisory
https://support.apple.com/en-us/HT212600Vendor Advisory
https://support.apple.com/en-us/HT212602Vendor Advisory
https://support.apple.com/en-us/HT212603Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30805?

How severe is CVE-2021-30805?

CVE-2021-30805 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.05% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30805?

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-2021-30805?

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

Scan your code now

Source: NVD / NIST