CVE-2021-1817

moderate-risk
Published 2021-09-08

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to arbitrary code execution.

Do I need to act?

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0.97% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (5)

Affected Vendors

Apple

References (8)

Vendor Advisory https://support.apple.com/en-us/HT212317
Vendor Advisory https://support.apple.com/en-us/HT212323
Vendor Advisory https://support.apple.com/en-us/HT212324
Vendor Advisory https://support.apple.com/en-us/HT212325
Vendor Advisory https://support.apple.com/en-us/HT212317
Vendor Advisory https://support.apple.com/en-us/HT212323
Vendor Advisory https://support.apple.com/en-us/HT212324
Vendor Advisory https://support.apple.com/en-us/HT212325
45
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 3/34 · Minimal
Exposure 12/34 · Low