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Vulnerability record · CVE-2021-30937 · published 24 August 2021

CVE-2021-30937: Apple ipados out-of-bounds write vulnerability

Apple · Ipados

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in macOS Big Sur 11.6.2, tvOS 15.2, macOS Monterey 12.1, Security Update 2021-008 Catalina, iOS 15.2 and iPadOS 15.2, watchOS 8.3. A malicious application may be able to execute arbitrary code with kernel privileges.

7.8 CVSS 3.1 High EPSS 17% · top 3.0% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 9.3
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in macOS Big Sur 11.6.2, tvOS 15.2, macOS Monterey 12.1, Security Update 2021-008 Catalina, iOS 15.2 and iPadOS 15.2, watchOS 8.3. A malicious application may be able to execute arbitrary code with kernel privileges.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/165475/XNU-inm_merge-Heap-Use-After-Free.html
https://support.apple.com/en-us/HT212975
https://support.apple.com/en-us/HT212976
https://support.apple.com/en-us/HT212978
https://support.apple.com/en-us/HT212979
https://support.apple.com/en-us/HT212980
https://support.apple.com/en-us/HT212981
http://packetstormsecurity.com/files/165475/XNU-inm_merge-Heap-Use-After-Free.html
https://support.apple.com/en-us/HT212975
https://support.apple.com/en-us/HT212976
https://support.apple.com/en-us/HT212978
https://support.apple.com/en-us/HT212979
https://support.apple.com/en-us/HT212980
https://support.apple.com/en-us/HT212981

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-30937), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.