Vulnerability Details : CVE-2021-40539

Public exploit exists!
Used for ransomware!
Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.
Published 2021-09-07 17:15:07
Updated 2025-02-03 16:15:31
Source MITRE
View at NVD,   CVE.org
Vulnerability category: Execute code

Products affected by CVE-2021-40539

CVE-2021-40539 is in the CISA Known Exploited Vulnerabilities Catalog

This issue is known to have been leveraged as part of a ransomware campaign.
CISA vulnerability name:
Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability affecting the REST API URLs which allow for remote code execution.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-40539
Added on 2021-11-03 Action due date 2021-11-17

Exploit prediction scoring system (EPSS) score for CVE-2021-40539

EPSS FAQ
94.42%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 100 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2021-40539

  • ManageEngine ADSelfService Plus CVE-2021-40539
    Disclosure Date: 2021-09-07
    First seen: 2022-12-23
    exploit/windows/http/manageengine_adselfservice_plus_cve_2021_40539
    This module exploits CVE-2021-40539, a REST API authentication bypass vulnerability in ManageEngine ADSelfService Plus, to upload a JAR and execute it as the user running ADSelfService Plus - which is SYSTEM if started as a service.

CVSS scores for CVE-2021-40539

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.5
 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
 NIST
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 134c704f-9b21-4f2e-91b3-4a467353bcc0 2025-02-03
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 NIST

CWE ids for CVE-2021-40539

  • When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
    Assigned by: nvd@nist.gov (Primary)
  • The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-40539

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