What’s Vulnerable › Vulnerabilities

CVE-2021-30881

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-24 · updated 2026-06-17
• Weakness: CWE-20

Description

An input validation issue was addressed with improved memory handling. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, tvOS 15.1, watchOS 8.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. Unpacking a maliciously crafted archive may lead to arbitrary code execution.

Affected products

• Apple iPadOS: before 15.1 — fixed in 15.1
• Apple Iphone Os: before 15.1 — fixed in 15.1
• macOS: before 10.15.7; 10.15.7, 10.15.7-security_update_2020-001, 10.15.7-security_update_2021-001, 10.15.7-security_update_2021-002, 10.15.7-security_update_2021-003, 10.15.7-security_update_2021-004 (+3) — fixed in 10.15.7
• Apple macOS: from 11.0 before 11.6.1; 12.0 — fixed in 11.6.1
• Apple tvOS: before 15.1 — fixed in 15.1
• Apple watchOS: before 8.1 — fixed in 8.1

How to fix

Upgrade to a fixed version: Apple iPadOS 15.1; Apple Iphone Os 15.1; macOS 10.15.7; Apple macOS 11.6.1; Apple tvOS 15.1; Apple watchOS 8.1. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212867
• https://support.apple.com/en-us/HT212869
• https://support.apple.com/en-us/HT212871
• https://support.apple.com/en-us/HT212872
• https://support.apple.com/en-us/HT212874
• https://support.apple.com/en-us/HT212876
• https://support.apple.com/en-us/HT212867
• https://support.apple.com/en-us/HT212869
• https://support.apple.com/en-us/HT212871
• https://support.apple.com/en-us/HT212872
• https://support.apple.com/en-us/HT212874
• https://support.apple.com/en-us/HT212876

Get alerted when CVE-2021-30881 or the next vulnerability affects your stack