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    CVE-2021-40442

    Microsoft Excel Remote Code Execution Vulnerability

    Published:Nov 10, 2021
    Last Modified:Aug 19, 2026
    EPS:Nov 10, 2021
    EPSS Score:0.0207
    CVSS Score:7.8

    Affected Products

    Vendor
    Microsoft
    Product
    365 Apps
    Vendor
    Microsoft
    Product
    Excel
    Vendor
    Microsoft
    Product
    Excel 2013
    Vendor
    Microsoft
    Product
    Excel 2016
    Vendor
    Microsoft
    Product
    Office
    Vendor
    Microsoft
    Product
    Office 2019
    Vendor
    Microsoft
    Product
    Office 2021
    Vendor
    Microsoft
    Product
    Office Long Term Servicing Channel
    Vendor
    Microsoft
    Product
    Office Macos 2021
    Vendor
    Microsoft
    Product
    Office Online Server
    Vendor
    Microsoft
    Product
    Office Web Apps Server
    Vendor
    Microsoft
    Product
    Office Web Apps Server 2013
    Vendor
    Microsoft
    Product
    Sharepoint Enterprise Server
    Vendor
    Microsoft
    Product
    Sharepoint Server 2013

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-62804 (CVSS 7.8) — External control of file name or path in Microsoft Office Word allows an unauthorized attacker to execute code…
    CVE-2026-85875 (CVSS 5.5) — Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.…
    CVE-2026-83949 (CVSS 5.5) — Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.…
    CVE-2026-83951 (CVSS 5.5) — Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.…
    CVE-2026-81948 (CVSS 7.8) — Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.…
    CVE-2026-81950 (CVSS 7.8) — Double free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.…
    CVE-2026-81949 (CVSS 7.8) — Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code local…
    CVE-2026-81953 (CVSS 7.8) — Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.…
    CVE-2026-81959 (CVSS 7.8) — Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.…
    CVE-2026-81952 (CVSS 8.8) — Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a net…

    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