High severity · published Aug 24, 2021
CVE-2021-30865
An out-of-bounds read was addressed with improved input validation
7.8
CVSS
1%
EPSS
No
On KEV
Description
An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.6, Security Update 2021-005 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
macOS · Apple
11.0 before 11.6 · source: NVD
MO
Mac OS X · Apple
before 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; +2 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30865
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-30865
support.apple.com
https://support.apple.com/en-us/HT212804
support.apple.com
https://support.apple.com/en-us/HT212805
More from macOS
10.0
CVE-2025-43300
Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability
10.0
CVE-2025-24201
Apple Multiple Products WebKit Out-of-Bounds Write Vulnerability
10.0
CVE-2025-24085
Apple Multiple Products Use-After-Free Vulnerability
9.8
CVE-2026-65400
Apple macOS Improper Authentication Vulnerability
9.8
CVE-2025-31200
Apple Multiple Products Memory Corruption Vulnerability