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    CVE-2021-30858

    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.

    Published:Aug 24, 2021
    Last Modified:Oct 27, 2025
    EPS:Aug 24, 2021
    EPSS Score:0.01026
    CVSS Score:8.8

    CISA Notification

    Description

    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.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Nov 17, 2021
    1759 days ago
    Alert Date
    Nov 3, 2021
    1773 days ago

    Affected Products

    Vendor
    Apple
    Product
    Ipados
    Vendor
    Apple
    Product
    Iphone Os
    Vendor
    Apple
    Product
    Macos
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    https://github.com/Jeromeyoung/ps4_8.00_vuln_pochttps://github.com/kmeps4/CVEREV3

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-65367 (CVSS 5.5) — A null pointer dereference was addressed with improved input validation. This issue is fixed in iOS 18.7.9 and…
    CVE-2026-43670 (CVSS 8.8) — A Content Security Policy bypass was addressed with improved enforcement in AudioWorklet contexts. This issue …
    CVE-2026-65331 (CVSS 4.3) — This issue was addressed through improved state management. This issue is fixed in Safari 26.6.1, iOS 18.7.10 …
    CVE-2026-64760 (CVSS 5.5) — An information leakage was addressed with additional validation. This issue is fixed in iOS 18.7.10 and iPadOS…
    CVE-2026-43794 (CVSS 8.8) — A memory corruption issue was addressed with improved memory handling. This issue is fixed in Safari 26.6.1, i…
    CVE-2026-65346 (CVSS 8.8) — An integer overflow was addressed with improved input validation. This issue is fixed in iOS 26.6.1 and iPadOS…
    CVE-2026-65351 (CVSS 4.3) — This issue was addressed through improved state management. This issue is fixed in Safari 26.6.1, iOS 26.6.1 a…
    CVE-2026-64782 (CVSS 3.1) — A memory corruption vulnerability was addressed with improved locking. This issue is fixed in Safari 26.6.1, i…
    CVE-2026-65347 (CVSS 6.5) — The issue was addressed with improved checks. This issue is fixed in iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe…
    CVE-2026-43795 (CVSS 4.3) — The issue was addressed with improved memory handling. This issue is fixed in Safari 26.6.1, iOS 18.7.10 and i…

    References

    http://seclists.org/fulldisclosure/2021/Sep/25
    http://seclists.org/fulldisclosure/2021/Sep/27
    http://seclists.org/fulldisclosure/2021/Sep/29
    http://seclists.org/fulldisclosure/2021/Sep/38
    http://seclists.org/fulldisclosure/2021/Sep/39
    http://seclists.org/fulldisclosure/2021/Sep/50
    http://www.openwall.com/lists/oss-security/2021/09/20/1
    http://www.openwall.com/lists/oss-security/2021/10/26/9
    http://www.openwall.com/lists/oss-security/2021/10/27/1
    http://www.openwall.com/lists/oss-security/2021/10/27/2
    http://www.openwall.com/lists/oss-security/2021/10/27/4
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/
    https://support.apple.com/en-us/HT212804
    https://support.apple.com/en-us/HT212807
    https://support.apple.com/kb/HT212824
    https://www.debian.org/security/2021/dsa-4975
    https://www.debian.org/security/2021/dsa-4976
    http://seclists.org/fulldisclosure/2021/Sep/25
    http://seclists.org/fulldisclosure/2021/Sep/27
    http://seclists.org/fulldisclosure/2021/Sep/29
    http://seclists.org/fulldisclosure/2021/Sep/38
    http://seclists.org/fulldisclosure/2021/Sep/39
    http://seclists.org/fulldisclosure/2021/Sep/50
    http://www.openwall.com/lists/oss-security/2021/09/20/1
    http://www.openwall.com/lists/oss-security/2021/10/26/9
    http://www.openwall.com/lists/oss-security/2021/10/27/1
    http://www.openwall.com/lists/oss-security/2021/10/27/2
    http://www.openwall.com/lists/oss-security/2021/10/27/4
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/
    https://support.apple.com/en-us/HT212804
    https://support.apple.com/en-us/HT212807
    https://support.apple.com/kb/HT212824
    https://www.debian.org/security/2021/dsa-4975
    https://www.debian.org/security/2021/dsa-4976
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High