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Known exploited · Omnissa

CVE-2021-22054: Omnissa Workspace ONE Server-Side Request Forgery

What it is

Omnissa Workspace One UEM formerly known as VMware Workspace One UEM contains a server-side request forgery (SSRF) vulnerability that could allow a malicious actor with network access to UEM to send their requests without authentication and to gain access to sensitive information.

Added March 9, 2026Due March 23, 2026CISA KEV catalog 2026.10.01

Vendor
Omnissa
Product
Workspace One UEM
Added to KEV
March 9, 2026
CISA due date
March 23, 2026
Ransomware use
Unknown

What CISA requires

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Forensic triage

No

What to do now

  1. Find every instance of Workspace One UEM you run, including the forgotten ones, and check its version against the vendor advisory.
  2. Apply the vendor's fix or mitigation, before March 23, 2026 if you are bound by CISA's deadline, sooner if it faces the internet.
  3. Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
  4. Until every instance is patched, block the attack at the edge: a WAF in blocking mode stops SSRF payloads aimed at cloud metadata endpoints.

References

CVE-2021-22054 in the National Vulnerability Database

The Dome

Block it at the edge while you patch

The Dome's WAF runs the OWASP Core Rule Set in blocking mode and stops SSRF payloads aimed at cloud metadata endpoints before they reach your application.

See the Dome

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Source: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.