Every CVE Search/ Get API key

CVE-2021-40539

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API...

9.8 CriticalIn KEVPublic exploit

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

99.0%Up 97.6 points since Sep 8, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.

Record
CVE-2021-40539
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-706
Updated
2026-11-02
CVE List 9.8

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.

Record
CVE-2021-40539
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-706
Updated
2026-11-02
EUVDEUVD-2021-27714 9.8

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.

Record
EUVD-2021-27714
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-gww8-rh9f-5mjq 9.8

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API...

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.

Record
GHSA-gww8-rh9f-5mjq
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-287, CWE-706
Updated
2026-11-02
CISA KEV No score

Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability

Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability affecting the REST API URLs which allow for remote code execution.

Record
CVE-2021-40539
Weakness
CWE-55
Updated
2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
MetasploitManageEngine ADSelfService Plus CVE-2021-405392021-09-07
PoC in GitHubDarkSprings/CVE-2021-405392021-09-17
PoC in GitHubsynacktiv/CVE-2021-405392021-11-03
PoC in GitHublpyydxs/CVE-2021-405392024-10-12
PoC in GitHublpyzds/CVE-2021-405392024-10-12
PoC in GitHubBu0uCat/ADSelfService-Plus-RCE-CVE-2021-405392024-10-16
NucleiZoho ManageEngine ADSelfService Plus v6113 - Unauthenticated Remote Command Execution

History

History
RecordedChangedSources
exploitation, exploits
first indexedCVE List, EUVD, GitHub Advisories, CISA KEV, Metasploit, Nuclei, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-40539 is a critical vulnerability (CVSS 9.8) in Zoho Manageengine, published September 7, 2021. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 99.0%, the 99th percentile. No source names a fixed version.

References

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open