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    CVE-2021-30952

    An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

    Published:Aug 24, 2021
    Last Modified:Mar 6, 2026
    EPS:Aug 24, 2021
    EPSS Score:0.0186
    CVSS Score:8.8

    CISA Notification

    Description

    An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

    Required Action:

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Notes:

    No extra notes provided.

    Due Date
    Mar 26, 2026
    169 days ago
    Alert Date
    Mar 5, 2026
    190 days ago

    Affected Products

    Vendor
    Apple
    Product
    Ipados
    Vendor
    Apple
    Product
    Iphone Os
    Vendor
    Apple
    Product
    Macos
    Vendor
    Apple
    Product
    Safari
    Vendor
    Apple
    Product
    Tvos
    Vendor
    Apple
    Product
    Watchos
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Webkitgtk
    Product
    Webkitgtk
    Vendor
    Wpewebkit
    Product
    Wpe Webkit

    Exploits

    https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    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://www.openwall.com/lists/oss-security/2022/01/21/2
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
    https://support.apple.com/en-us/HT212975
    https://support.apple.com/en-us/HT212976
    https://support.apple.com/en-us/HT212978
    https://support.apple.com/en-us/HT212980
    https://support.apple.com/en-us/HT212982
    https://www.debian.org/security/2022/dsa-5060
    https://www.debian.org/security/2022/dsa-5061
    http://www.openwall.com/lists/oss-security/2022/01/21/2
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
    https://support.apple.com/en-us/HT212975
    https://support.apple.com/en-us/HT212976
    https://support.apple.com/en-us/HT212978
    https://support.apple.com/en-us/HT212980
    https://support.apple.com/en-us/HT212982
    https://www.debian.org/security/2022/dsa-5060
    https://www.debian.org/security/2022/dsa-5061
    https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952

    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