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CVE-2021-30855

MEDIUM
5.5
CVSS Score
Published: August 24, 2021 at 06:49 PM UTC
Updated: June 17, 2026 at 03:51 AM UTC
5 products affected across 1 vendormacOSiPhone OSiPadOS

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Severity
MEDIUM5.5
Exploit prediction
EPSS 2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iPadOS· Apple
95%
v < 14.8
Affected range stops below 14.8, so it looks safe — our inference, not a vendor statement
iPhone OS· Apple
95%
v < 14.8
Affected range stops below 14.8, so it looks safe — our inference, not a vendor statement
macOS· Apple
95%
v < 10.15.7v < 11.6v < 14.8v < 15v < 2021v < 810.15.710.15.7 security_update_2020-110.15.7 security_update_2021-110.15.7 security_update_2021-210.15.7 security_update_2021-310.15.7 security_update_2021-410.15.7 supplemental_update
Affected range stops below 10.15.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 15, so it looks safe — our inference, not a vendor statement
Affected range stops below 2021, so it looks safe — our inference, not a vendor statement
Affected range stops below 8, so it looks safe — our inference, not a vendor statement
tvOS· Apple
95%
v < 15.0
Affected range stops below 15.0, so it looks safe — our inference, not a vendor statement
watchOS· Apple
95%
v < 8.0
Affected range stops below 8.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (6)

x_refsource_MISC
Source: [email protected]
https://support.apple.com/en-us/HT212804
x_refsource_MISC
Source: [email protected]
https://support.apple.com/en-us/HT212805
x_refsource_MISC
Source: [email protected]
https://support.apple.com/en-us/HT212807
x_refsource_MISC
Source: [email protected]
https://support.apple.com/en-us/HT212814
x_refsource_MISC
Source: [email protected]
https://support.apple.com/en-us/HT212819
x_refsource_CONFIRM
Source: [email protected]
https://support.apple.com/kb/HT212815

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-59

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