TI-2021-11267 Aliases CVE-2021-30900

Out-of-bounds write in Apple iOS and iPadOS

CRITICAL 93Exploited in the wildCWE-787Published 2021-08-24 · Updated 2025-10-21

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 · CISA ADP. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Why it matters now

Exploitation Active In CISA KEV since 2023-03-30CISA due date 2023-04-20

EPSS 0.05204 92nd percentileScored 2026-11-07

Fix Fixed iOS and iPadOS (Apple): 15.1, 14.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apple	iOS and iPadOS	before 15.1	15.1	Patch available	CNA
Apple	iOS and iPadOS	before 14.8	14.8	Patch available	CNA

iOS and iPadOS VendorApple Affected before 15.1 Fixed in 15.1 Patch available CNA
iOS and iPadOS VendorApple Affected before 14.8 Fixed in 14.8 Patch available CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:ipados::::::::	before 14.8.1	Vulnerable	Apple
cpe:2.3:o:apple:ipados:15.0:::::::*	15.0	Vulnerable	Apple
cpe:2.3:o:apple:iphone_os::::::::	before 14.8.1	Vulnerable	Apple
cpe:2.3:o:apple:iphone_os:15.0:::::::*	15.0	Vulnerable	Apple
cpe:2.3:o:apple:macos::::::::	before 11.6.1	Vulnerable	Apple

cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 14.8.1 Vulnerable ·Apple
cpe:2.3:o:apple:ipados:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·Apple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 14.8.1 Vulnerable ·Apple
cpe:2.3:o:apple:iphone_os:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·Apple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 11.6.1 Vulnerable ·Apple

Remediation

Fix · CNA iOS and iPadOS (Apple) Fixed in 15.1
Fix · CNA iOS and iPadOS (Apple) Fixed in 14.8

Fixed in the same release

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

Release · 2021-08-24
Apple iOS and iPadOS 15.1
21 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 19 LOW
Other records, highest priority first
- TI-2021-11258 Buffer overflow in Apple iOS and iPadOSPriority MEDIUM 42
- TI-2021-11286 Out-of-bounds write in Apple iOS and iPadOSPriority LOW 37
- TI-2021-11284 Improper input validation in Apple iOS and iPadOSPriority LOW 37
Show all 21 records →
Release · 2021-08-24
Apple iOS and iPadOS 14.8
12 records Highest priority Priority CRITICAL 2 CRITICAL, 1 MEDIUM, 9 LOW
Other records, highest priority first
- TI-2021-11253 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2021-11224 Type confusion in Apple iOS and iPadOSPriority MEDIUM 41
- TI-2021-11286 Out-of-bounds write in Apple iOS and iPadOSPriority LOW 37
Show all 12 records →

Timeline

2023-03-30 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2021-30900

References

Advisory 3

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