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    CVE-2021-20147

    ManageEngine ADSelfService Plus below build 6116 contains an observable response discrepancy in the UMCP operation of the ChangePasswordAPI. This allows an unauthenticated remote attacker to determine whether a Windows domain user exists.

    Published:Jan 3, 2022
    Last Modified:Nov 21, 2024
    EPS:Jan 3, 2022
    EPSS Score:0.06868
    CVSS Score:5.3

    Affected Products

    Vendor
    Zohocorp
    Product
    Manageengine Adselfservice Plus

    Exploits

    https://www.tenable.com/security/research/tra-2021-52https://www.tenable.com/security/research/tra-2021-52

    Common Weakness Enumeration

    CWE-203 Observable Discrepancy

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-189 Black Box Reverse Engineering

    Related CVEs

    CVE-2026-3183 (CVSS 7.1) — Zohocorp ManageEngine ADSelfService Plus versions before 6524 are vulnerable to Multi Factor Authentication By…
    CVE-2026-11374 (CVSS 9) — In ManageEngine ADSelfService Plus, RecoveryManager Plus, M365 Manager Plus, and ADAudit Plus, the SSO tickets…
    CVE-2026-2740 (CVSS 8.4) — Zohocorp ManageEngine ADSelfService Plus version before 6525, DataSecurity Plus before 6264 and RecoveryManage…
    CVE-2026-1367 (CVSS 8.3) — Zohocorp ManageEngine ADSelfService Plus versions 6522 and below are vulnerable to authenticated SQL Injection…
    CVE-2025-11250 (CVSS 9.1) — Zohocorp ManageEngine ADSelfService Plus versions before 6519 are vulnerable to Authentication Bypass due to i…
    CVE-2025-3833 (CVSS 8.1) — Zohocorp ManageEngine ADSelfService Plus versions 6513 and prior are vulnerable to authenticated SQL injection…
    CVE-2025-1723 (CVSS 8.1) — Zohocorp ManageEngine ADSelfService Plus versions 6510 and below are vulnerable to account takeover due to the…
    CVE-2024-27310 (CVSS 5.3) — Zoho ManageEngine ADSelfService Plus versions below 6401 are vulnerable to the DOS attack due to the malicious…
    CVE-2024-0252 (CVSS 8.8) — ManageEngine ADSelfService Plus versions 6401 and below are vulnerable to the remote code execution due to the…
    CVE-2023-6105 (CVSS 5.5) — An information disclosure vulnerability exists in multiple ManageEngine products that can result in encryption…

    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