CVE-2021-37539 — Manageengine Admanager Plus
CRITICALCVE-2021-37539 is a critical-severity (CVSS 9.8) Unrestricted File Upload vulnerability in zohocorp manageengine admanager plus. EPSS puts its 30-day exploitation probability at 92.9% (100th percentile). A fix is available — see the affected versions and patch details below.
Zoho ManageEngine ADManager Plus before 7111 is vulnerable to unrestricted file which leads to Remote code execution.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-37539 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 398,142 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Zoho ManageEngine ADManager Plus before 7111 is vulnerable to unrestricted file which leads to Remote code execution.
Affected Products
manageengine admanager pluszohocorpDetection & mitigation playbook
Vendor / applianceDetect
Inventory every zohocorp manageengine admanager plus deployment and check each version against the affected-products list above.
Fix
Apply the zohocorp manageengine admanager plus security patch or hotfix for CVE-2021-37539 on the affected version, following the vendor advisory for your exact build.
Workarounds
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2021-37539 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.