Auth bypass in VMware Cloud Foundation
CVE-2021-21986
The vSphere Client (HTML5) contains a vulnerability in a vSphere authentication mechanism for the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. A malicious actor with network access to port 443 on vCenter Server may perform actions allowed by the impacted plug-ins without authentication.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.133 (96.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.129 · newest: 0.133 · change: +0.003
Affected products
- VMware Cloud Foundation
- VMware Vcenter Server — versions 6.5, 6.7, 7.0
- VMware Vcenter Server And Cloud Foundation — versions VMware vCenter Server (7.x before 7.0 U2b, 6.7 before 6.7 U3n, 6.5 before 6.5 U3p) and VMware Cloud Foundation (4.x before 4.2.1, 3.x before 3.10.2.1)
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.vmware.com/security/advisories/VMSA-2021-0010.html (Vendor Advisory)
- packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21986?
- CVE-2021-21986 is a critical-severity vulnerability in VMware Cloud Foundation, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2021-05-26.
- How severe is CVE-2021-21986?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-21986 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.