CVE-2021-31010 on CISA KEV

A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was awar

01What CISA says about this vulnerability

A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was aware of a report that this issue may have been actively exploited at the time of release..

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• support.apple.com — https://support.apple.com/en-us/HT212804
• support.apple.com — https://support.apple.com/en-us/HT212805
• support.apple.com — https://support.apple.com/en-us/HT212807
• support.apple.com — https://support.apple.com/en-us/HT212806
• support.apple.com — https://support.apple.com/en-us/HT212824

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Apple	macOS	unspecified
Apple	macOS	unspecified
Apple	watchOS	unspecified
Apple	watchOS	unspecified
Apple	watchOS	unspecified

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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