Rule Category

SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.

Alert Message

SERVER-WEBAPP VMWare vSphere Client remote code execution attempt

Rule Explanation

This rule is designed to alert on attempts to exploit an exposed rest API endpoint in VMWare vSphere Client. Attackers who exploit this can remotely execute code on a vulnerable system. This vulnerability requires multiple requests to execute, and this rule is designed to detect any one of those different requests.

What To Look For

This rule alerts on an attempt to exploit CVE-2021-21985.

Known Usage

Public information/Proof of Concept available

False Positives

No known false positives


Cisco Talos Intelligence Group

Rule Groups

No rule groups


Additional Links

Rule Vulnerability


Not Applicable

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.
Loading description

MITRE ATT&CK Framework

Tactic: Initial Access

Technique: Exploit Public-Facing Application

For reference, see the MITRE ATT&CK vulnerability types here: