CVE Watch—

CVE-2021-40539

Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability

CVSS

—

No CVSS

EPSS

99.0%

p100

KEV

YES

Nov 3, 2021

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

99.0%EPSS · 30 days99.0%

2026-06-302026-07-16

KEV catalog record

Product

Zoho / ManageEngine

Vulnerability

Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

Nov 17, 2021

Known ransomware use

Yes

Summary description

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

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-40539

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