CVE-2021-30858 on CISA KEV

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been act

01What CISA says about this vulnerability

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

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/HT212807
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/27
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/25
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/29
• www.openwall.com — http://www.openwall.com/lists/oss-security/2021/09/20/1
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/38
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/39
• www.debian.org — https://www.debian.org/security/2021/dsa-4975
• www.debian.org — https://www.debian.org/security/2021/dsa-4976
• support.apple.com — https://support.apple.com/kb/HT212824
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/50
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• www.openwall.com — http://www.openwall.com/lists/oss-security/2021/10/26/9
• www.openwall.com — http://www.openwall.com/lists/oss-security/2021/10/27/1
• www.openwall.com — http://www.openwall.com/lists/oss-security/2021/10/27/2
• www.openwall.com — http://www.openwall.com/lists/oss-security/2021/10/27/4

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	iOS	unspecified

06Detection

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

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