ACTIVELY EXPLOITED
CVE-2021-40539: Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability
| Vendor | Zoho |
|---|---|
| Product | ManageEngine |
| Actively exploited | Yes |
| Added to CISA KEV | 3 Nov 2021 |
| CISA federal deadline | 17 Nov 2021 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-55 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability affecting the REST API URLs which allow for remote code execution.
SOURCES
Other Zoho flaws
- CVE-2022-28810: Zoho ManageEngine ADSelfService Plus Remote Code Execution Vulnerability
- CVE-2022-47966: Zoho ManageEngine Multiple Products Remote Code Execution Vulnerability
- CVE-2022-35405: Zoho ManageEngine Multiple Products Remote Code Execution Vulnerability
- CVE-2021-44515: Zoho Desktop Central Authentication Bypass Vulnerability
- CVE-2021-44077: Zoho ManageEngine ServiceDesk Plus Remote Code Execution Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.