What’s Vulnerable › Vulnerabilities

CVE-2021-30823

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-28 · updated 2026-06-17

Description

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Monterey 12.0.1, iOS 14.8 and iPadOS 14.8, tvOS 15, Safari 15, watchOS 8. An attacker in a privileged network position may be able to bypass HSTS.

Affected products

• Apple iPadOS: before 14.8 — fixed in 14.8
• Apple Iphone Os: before 14.8 — fixed in 14.8
• Apple macOS: before 12.0.1 — fixed in 12.0.1
• Apple Safari: before 15.0.0 — fixed in 15.0.0
• Apple tvOS: before 15.0 — fixed in 15.0
• Apple watchOS: before 8.0 — fixed in 8.0

How to fix

Upgrade to a fixed version: Apple iPadOS 14.8; Apple Iphone Os 14.8; Apple macOS 12.0.1; Apple Safari 15.0.0; Apple tvOS 15.0; Apple watchOS 8.0. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/12/20/6
• https://support.apple.com/en-us/HT212807
• https://support.apple.com/en-us/HT212815
• https://support.apple.com/en-us/HT212816
• https://support.apple.com/en-us/HT212819
• https://support.apple.com/en-us/HT212869
• https://support.apple.com/kb/HT212953
• http://www.openwall.com/lists/oss-security/2021/12/20/6
• https://support.apple.com/en-us/HT212807
• https://support.apple.com/en-us/HT212815
• https://support.apple.com/en-us/HT212816
• https://support.apple.com/en-us/HT212819

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