Vulnerability · Published Jul 13, 2021 · Assigned by vmware
CVE-2021-21994
Critical 9.8
In plain English
A critical-severity security flaw in VMware ESXi and VMware Cloud Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 67% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.2%top 32.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC
Official description
SFCB (Small Footprint CIM Broker) as used in ESXi has an authentication bypass vulnerability. A malicious actor with network access to port 5989 on ESXi may exploit this issue to bypass SFCB authentication by sending a specially crafted request.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | VMware ESXi and VMware Cloud Foundation | VMware ESXi(7.0 before ESXi70U2-17630552, 6.7 before ESXi670-202103101-SG, 6.5 before ESXi650-202107401-SG) and VMware Cloud Foundation (4.x, 3.x before 3.10.2) |
References
- https://www.vmware.com/security/advisories/VMSA-2021-0014.html x_refsource_MISC