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    CVE-2021-38646

    Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

    Published:Sep 15, 2021
    Last Modified:Aug 10, 2026
    EPS:Sep 15, 2021
    EPSS Score:0.044
    CVSS Score:7.8

    CISA Notification

    Description

    Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Apr 18, 2022
    1607 days ago
    Alert Date
    Mar 28, 2022
    1628 days ago

    Affected Products

    Vendor
    Microsoft
    Product
    365 Apps
    Vendor
    Microsoft
    Product
    Office
    Vendor
    Microsoft
    Product
    Office 2013
    Vendor
    Microsoft
    Product
    Office 2016
    Vendor
    Microsoft
    Product
    Office 2019

    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