Possible Pre-Auth SSRF via VMware Workspace One UEM BlobHandler CVE-2021-22054
- Category
- webserver
- Author
- HuntRule
- Published
- 2026-06-02
- Updated
- 2026-08-28
ATT&CK techniques
Initial Access → Cred AccessRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects HTTP requests to the VMware Workspace One UEM BlobHandler.ashx endpoint carrying a Url parameter. CVE-2021-22054 is a pre-authentication server-side request forgery reached through this handler with an encrypted Url payload as detailed by Assetnote, letting attackers pivot to internal services and cloud metadata.
Reporting behind it
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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