What’s Vulnerable › Vulnerabilities

CVE-2021-30799

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-08 · updated 2026-06-17
• Weakness: CWE-787

Description

Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

• Apple Iphone Os: before 14.7 — fixed in 14.7
• macOS: from 10.14 through 10.14.6; from 10.15 before 10.15.7; 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006, 10.14.6-security_update_2019-007 (+21) — fixed in 10.15.7
• Apple macOS: from 11.0 before 11.5 — fixed in 11.5

How to fix

Upgrade to a fixed version: Apple Iphone Os 14.7; macOS 10.15.7; Apple macOS 11.5. 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/HT212603
• 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/HT212603

Get alerted when CVE-2021-30799 or the next vulnerability affects your stack