TI-2021-11304 Aliases CVE-2021-30937

Out-of-bounds write in Apple watchOS

MEDIUM 51CWE-787Published 2021-08-24 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.17294 97th percentileScored 2026-11-07

Fix Fixed watchOS (Apple): 8.3iOS and iPadOS (Apple): 15.2+1 more product

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apple	watchOS	before 8.3	8.3	Patch available	CNA
Apple	iOS and iPadOS	before 15.2	15.2	Patch available	CNA
Apple	macOS	before 12.1	12.1	Patch available	CNA
Apple	macOS	before 11.6	11.6	Patch available	CNA
Apple	macOS	before 15.2	15.2	Patch available	CNA
Apple	macOS	before 2021	2021	Patch available	CNA

watchOS VendorApple Affected before 8.3 Fixed in 8.3 Patch available CNA
iOS and iPadOS VendorApple Affected before 15.2 Fixed in 15.2 Patch available CNA
macOS VendorApple Affected before 12.1 Fixed in 12.1 Patch available CNA
macOS VendorApple Affected before 11.6 Fixed in 11.6 Patch available CNA
macOS VendorApple Affected before 15.2 Fixed in 15.2 Patch available CNA
macOS VendorApple Affected before 2021 Fixed in 2021 Patch available CNA

CPE configurations NVD · 15

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:ipados::::::::	before 15.2	Vulnerable	Apple
cpe:2.3:o:apple:iphone_os::::::::	before 15.2	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x::::::::	10.15 – 10.15.7	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020::::::	10.15.7 security_update_2020	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001::::::	10.15.7 security_update_2020-001	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-005::::::	10.15.7 security_update_2020-005	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-007::::::	10.15.7 security_update_2020-007	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001::::::	10.15.7 security_update_2021-001	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002::::::	10.15.7 security_update_2021-002	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003::::::	10.15.7 security_update_2021-003	Vulnerable	Apple

cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 15.2 Vulnerable ·Apple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 15.2 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* Versions 10.15 – 10.15.7 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:* Versions 10.15.7 security_update_2020 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* Versions 10.15.7 security_update_2020-001 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-005:*:*:*:*:*:* Versions 10.15.7 security_update_2020-005 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-007:*:*:*:*:*:* Versions 10.15.7 security_update_2020-007 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* Versions 10.15.7 security_update_2021-001 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* Versions 10.15.7 security_update_2021-002 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* Versions 10.15.7 security_update_2021-003 Vulnerable ·Apple

Show 5 more CPE

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006::::::	10.15.7 security_update_2021-006	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007::::::	10.15.7 security_update_2021-007	Vulnerable	Apple
cpe:2.3:o:apple:macos::::::::	11.0 to before 11.6.2; 12.0 to before 12.1	Vulnerable	Apple
cpe:2.3:o:apple:tvos::::::::	before 15.2	Vulnerable	Apple
cpe:2.3:o:apple:watchos::::::::	before 8.3	Vulnerable	Apple

cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:* Versions 10.15.7 security_update_2021-006 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:* Versions 10.15.7 security_update_2021-007 Vulnerable ·Apple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions 11.0 to before 11.6.2; 12.0 to before 12.1 Vulnerable ·Apple
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 15.2 Vulnerable ·Apple
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 8.3 Vulnerable ·Apple

Remediation

Fix · CNA watchOS (Apple) Fixed in 8.3
Fix · CNA iOS and iPadOS (Apple) Fixed in 15.2
Fix · CNA macOS (Apple) Fixed in 12.1
Fix · CNA macOS (Apple) Fixed in 11.6
Fix · CNA macOS (Apple) Fixed in 15.2
Fix · CNA macOS (Apple) Fixed in 2021

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2021-08-24
Apple macOS 11.6
72 records Highest priority Priority CRITICAL 4 CRITICAL, 5 MEDIUM, 63 LOW
Other records, highest priority first
- TI-2021-11230 Use after free in Apple macOSPriority CRITICAL 97
- TI-2021-11253 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2021-11232 Integer overflow in Apple macOSPriority CRITICAL 93
Show all 72 records →
Release · 2021-08-24
Apple macOS 2021
55 records Highest priority Priority CRITICAL 2 CRITICAL, 3 MEDIUM, 50 LOW
Other records, highest priority first
- TI-2021-11241 Type confusion in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2021-11373 Deserialization of untrusted data in Apple macOSPriority CRITICAL 90
- TI-2021-11341 Incorrect authorization in Apple macOSPriority MEDIUM 41
Show all 55 records →

Show 4 more groups

Release · 2021-08-24
Apple macOS 12.1
40 records Highest priority Priority MEDIUM 6 MEDIUM, 34 LOW
Other records, highest priority first
- TI-2021-11372 Apple iOS and iPadOS: Multiple issues in HDF5Priority MEDIUM 44
- TI-2021-11341 Incorrect authorization in Apple macOSPriority MEDIUM 41
- TI-2021-11306 Out-of-bounds read in Apple watchOSPriority MEDIUM 41
Show all 40 records →
Release · 2021-08-24
Apple iOS and iPadOS 15.2
38 records Highest priority Priority CRITICAL 1 CRITICAL, 4 MEDIUM, 33 LOW
Other records, highest priority first
- TI-2021-11348 Buffer overflow in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2021-11372 Apple iOS and iPadOS: Multiple issues in HDF5Priority MEDIUM 44
- TI-2021-11306 Out-of-bounds read in Apple watchOSPriority MEDIUM 41
Show all 38 records →
Release · 2021-08-24
Apple watchOS 8.3
22 records Highest priority Priority MEDIUM 3 MEDIUM, 19 LOW
Other records, highest priority first
- TI-2021-11306 Out-of-bounds read in Apple watchOSPriority MEDIUM 41
- TI-2021-11357 Buffer overflow in Apple watchOSPriority MEDIUM 40
- TI-2021-11322 Race condition in Apple watchOSPriority LOW 39
Show all 22 records →
Release · 2021-08-24
Apple macOS 15.2
18 records Highest priority Priority MEDIUM 3 MEDIUM, 15 LOW
Other records, highest priority first
- TI-2021-11306 Out-of-bounds read in Apple watchOSPriority MEDIUM 41
- TI-2021-11357 Buffer overflow in Apple watchOSPriority MEDIUM 40
- TI-2021-11322 Race condition in Apple watchOSPriority LOW 39
Show all 18 records →

Timeline

2026-10-02 Threatist record created from CVE-2021-30937

References

Other 7

TI-2025-28008 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
TI-2025-22441 Apple iOS and iPadOS: An attacker with arbitrary read and write capability may be able to… KEVCVSS 3.1CRITICAL 9.8
TI-2025-22440 Memory corruption in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
TI-2025-17951 Out-of-bounds write in Apple Safari KEVCVSS 3.1CRITICAL 10.0
TI-2025-17847 Use after free in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
TI-2022-06854 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8

See all 2382 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences

Out-of-bounds write in Apple watchOS

Key facts

Summary

Why it matters now

SSVC decision points

Affected products

CPE configurations NVD · 15

Remediation

Fixed in the same release

Apple macOS 11.6

Apple macOS 2021

Apple macOS 12.1

Apple iOS and iPadOS 15.2

Apple watchOS 8.3

Apple macOS 15.2

Timeline

References

Other 7

More Apple Ipados vulnerabilities

Sources