CVE-2021-1805

Name: CVE-2021-1805
Creator: NVD / NIST
Published: 2021-04-02T19:15:20.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.14%

Last modified Jun 17, 2026

CVE-2021-1805 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 11.2.1, macOS Catalina 10.15.7 Supplemental Update, macOS Mojave 10.14.6 Security Update 2021-002. EPSS estimates a 1.14% 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 11.2.1, macOS Catalina 10.15.7 Supplemental Update, macOS Mojave 10.14.6 Security Update 2021-002. 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

1.14%

62.6th 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, < 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

References

http://seclists.org/fulldisclosure/2021/Apr/54Mailing List, Third Party Advisory
https://support.apple.com/en-us/HT212177Vendor Advisory
https://support.apple.com/kb/HT212327Vendor Advisory
http://seclists.org/fulldisclosure/2021/Apr/54Mailing List, Third Party Advisory
https://support.apple.com/en-us/HT212177Vendor Advisory
https://support.apple.com/kb/HT212327Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-1805?

How severe is CVE-2021-1805?

CVE-2021-1805 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1805?

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-2021-1805?

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

Scan your code now

Source: NVD / NIST