What’s Vulnerable › Vulnerabilities

CVE-2021-30776

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-08 · updated 2026-06-17

Description

A logic issue was addressed with improved validation. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7, Security Update 2021-004 Catalina. Playing a malicious audio file may lead to an unexpected application termination.

Affected products

• Apple Iphone Os: before 14.7 — fixed in 14.7
• macOS: from 10.15 through 10.15.6; 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-security_update_2021-001 (+3)
• Apple macOS: before 11.5 — fixed in 11.5
• Apple tvOS: before 14.7 — fixed in 14.7
• Apple watchOS: before 7.6 — fixed in 7.6

How to fix

Upgrade to a fixed version: Apple Iphone Os 14.7; Apple macOS 11.5; Apple tvOS 14.7; Apple watchOS 7.6. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212600
• https://support.apple.com/en-us/HT212601
• https://support.apple.com/en-us/HT212602
• https://support.apple.com/en-us/HT212604
• https://support.apple.com/en-us/HT212605
• https://support.apple.com/en-us/HT212600
• https://support.apple.com/en-us/HT212601
• https://support.apple.com/en-us/HT212602
• https://support.apple.com/en-us/HT212604
• https://support.apple.com/en-us/HT212605

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