CVE-2021-30765

Name: CVE-2021-30765
Creator: NVD / NIST
Published: 2021-09-08T14:15:10.423+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2021-30765 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An out-of-bounds write 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 1.29% chance of exploitation in the next 30 days.

Description

An out-of-bounds write 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

7.8/10

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

EPSS Probability

1.29%

66.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Apple	Mac Os X	10.14
Apple	Mac Os X	10.14.0
Apple	Mac Os X	10.14.1
Apple	Mac Os X	10.14.2
Apple	Mac Os X	10.14.3
Apple	Mac Os X	10.14.4
Apple	Mac Os X	10.14.5
Apple	Mac Os X	10.14.6
Apple	Mac Os X	10.15
Apple	Mac Os X	10.15.1
Apple	Mac Os X	10.15.2
Apple	Mac Os X	10.15.3
Apple	Mac Os X	10.15.4
Apple	Mac Os X	10.15.5
Apple	Mac Os X	10.15.6
Apple	Mac Os X	10.15.7
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-2021-30765?

How severe is CVE-2021-30765?

CVE-2021-30765 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30765?

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-2021-30765?

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

Scan your code now

Source: NVD / NIST