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

criticalknown exploitedpublic exploitCVE-2021-40539
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability affecting the REST API URLs which allow for remote code execution.

CSIRTS triage

vendor: Zohoproduct: ManageEngine ADSelfService PlusAuthentication bypassRemote code execution
What
Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability affecting the REST API URLs, allowing for remote code execution.
Who is affected
Deployments of Zoho ManageEngine ADSelfService Plus are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of ManageEngine ADSelfService Plus.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-40539coverage & exploitation statusNVD · CVE.org

Recent advisories for Zoho ManageEngine ADSelfService

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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