TI-2021-11227 Aliases CVE-2021-30855

Link following in Apple macOS

LOW 29CWE-59Published 2021-08-24 · Updated 2024-08-03

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-59 and the CVSS impact.

Summary

A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files.

Why it matters now

EPSS 0.02396 84th percentileScored 2026-11-07

Fix Fixed macOS (Apple): 11.6, 2021, 14.8 +2

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	macOS	before 11.6	11.6	Patch available	CNA
Apple	macOS	before 2021	2021	Patch available	CNA
Apple	macOS	before 14.8	14.8	Patch available	CNA
Apple	macOS	before 15	15	Patch available	CNA
Apple	macOS	before 8	8	Patch available	CNA

macOS VendorApple Affected before 11.6 Fixed in 11.6 Patch available CNA
macOS VendorApple Affected before 2021 Fixed in 2021 Patch available CNA
macOS VendorApple Affected before 14.8 Fixed in 14.8 Patch available CNA
macOS VendorApple Affected before 15 Fixed in 15 Patch available CNA
macOS VendorApple Affected before 8 Fixed in 8 Patch available CNA

CPE configurations NVD · 13

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:ipados::::::::	before 14.8	Vulnerable	Apple
cpe:2.3:o:apple:iphone_os::::::::	before 14.8	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x::::::::	before 10.15.7	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:-::::::	10.15.7	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_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:mac_os_x:10.15.7:security_update_2021-004::::::	10.15.7 security_update_2021-004	Vulnerable	Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update::::::	10.15.7 supplemental_update	Vulnerable	Apple

cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 14.8 Vulnerable ·Apple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 14.8 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* Versions before 10.15.7 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* Versions 10.15.7 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_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
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* Versions 10.15.7 security_update_2021-004 Vulnerable ·Apple
cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* Versions 10.15.7 supplemental_update Vulnerable ·Apple

Show 3 more CPE

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:macos::::::::	before 11.6	Vulnerable	Apple
cpe:2.3:o:apple:tvos::::::::	before 15.0	Vulnerable	Apple
cpe:2.3:o:apple:watchos::::::::	before 8.0	Vulnerable	Apple

cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 11.6 Vulnerable ·Apple
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 15.0 Vulnerable ·Apple
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 8.0 Vulnerable ·Apple

Remediation

Fix · CNA macOS (Apple) Fixed in 11.6
Fix · CNA macOS (Apple) Fixed in 2021
Fix · CNA macOS (Apple) Fixed in 14.8
Fix · CNA macOS (Apple) Fixed in 15
Fix · CNA macOS (Apple) Fixed in 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 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-2021-11304 Out-of-bounds write in Apple watchOSPriority MEDIUM 51
Show all 55 records →

Show 3 more groups

Release · 2021-08-24
Apple macOS 14.8
4 records Highest priority Priority LOW 4 LOW
Other records, highest priority first
- TI-2021-11295 Out-of-bounds write in Apple macOSPriority LOW 37
- TI-2021-11231 Type confusion in Apple macOSPriority LOW 36
- TI-2021-11229 Race condition in Apple macOSPriority LOW 33
Show all 4 records →
Release · 2021-08-24
Apple macOS 15
4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2021-11292 Incorrect authorization in Apple macOSPriority MEDIUM 42
- TI-2021-11295 Out-of-bounds write in Apple macOSPriority LOW 37
- TI-2021-11229 Race condition in Apple macOSPriority LOW 33
Show all 4 records →
Release · 2021-08-24
Apple macOS 8
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2021-11229 Race condition in Apple macOSPriority LOW 33
Show all 2 records →

Timeline

2026-10-02 Threatist record created from CVE-2021-30855

References

Other 6

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