CVE-2021-40539: Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability

CVE-2021-40539 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

Zoho ManageEngine ADSelfService Plus is vulnerable to an authentication bypass affecting REST API URLs. Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code on the system.

Technologies: Zoho ManageEngine. Vendors: Zoho.

Quick answers

Is CVE-2021-40539 exploited in the wild?
Yes. CVE-2021-40539 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-40539?
Critical severity, with a CVSS score of 9.8, published 3 November 2021.
Which products and versions are affected?
Zoho Corp ManageEngine ADSelfService Plus 6113 and prior.
Is there a fix for CVE-2021-40539?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-40539 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-40539?
Check whether you run Zoho ManageEngine. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Zoho Corp ManageEngine ADSelfService Plus 6113 and prior

Timeline

  • 2021-11-03: disclosed
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

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