Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 87.6%; technical severity is CVSS 5.3.
The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. This affects: VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
Who should care
- Teams operating Cloud Foundation, vCenter Server, vCenter Server and Cloud Foundation
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Cloud Foundation, vCenter Server, vCenter Server and Cloud Foundation is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- VMware Security advisory VMSA-2021-0002
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CWE
- CWE-20
- Affected versions
- VMware Cloud Foundation (Start Including 3.0, End Excluding 3.10.1.2 | Start Including 4.0, End Excluding 4.2); VMware vCenter Server (Version 6.5 | Version 6.5 | Version 6.5 | Version 6.5); VMware vCenter Server and Cloud Foundation
- Fixed versions
- VMware Cloud Foundation (Fixed from 3.10.1.2, 4.2)
- Published
- 24 February 2021
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 87.6%
- Signal calculated at 79