CVE-2021-40539: Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability
Description
Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability in its REST API URLs that allows remote code execution. This vulnerability has been exploited in the wild and is known to be used in ransomware campaigns. The affected versions are not explicitly stated in the provided data. The severity of this vulnerability is high due to the potential for unauthorized remote code execution.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2021-40539 is an authentication bypass vulnerability in Zoho ManageEngine ADSelfService Plus affecting the REST API URLs. This flaw enables attackers to bypass authentication controls and execute arbitrary code remotely. The vulnerability has been observed in active exploitation scenarios, including ransomware campaigns. No specific affected versions or patch information is provided in the input data.
Potential Impact
Successful exploitation allows remote attackers to bypass authentication and execute arbitrary code on the affected system. This can lead to full system compromise and has been leveraged in ransomware attacks, indicating significant operational and security impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, organizations should monitor vendor communications closely and apply updates or mitigations as soon as they become available.
Threat ID: 6adc6f613fe894698b2dda76
Added to database: 10/24/2026, 08:42:09 UTC
Last enriched: 10/24/2026, 08:42:36 UTC
Last updated: 10/24/2026, 09:23:32 UTC
Views: 6
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.