CVE intelligence and bounded remediation

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

Critical CVSS 9.8 CISA KEV

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

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-09-07
CISA KEV
Known exploited
Ecosystem
software/application
Weaknesses
CWE-706

Affected products

  • zohocorp / manageengine_adselfservice_plus
  • zohocorp / manageengine_adselfservice_plus / 6.1

Showing 2 representative product identities from 10 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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