CVE-2021-21994 Auth bypass in VMware ESXi and VMware Cloud Foundation
Attackers can bypass SFCB authentication in VMware ESXi by sending crafted requests to port 5989, requiring immediate patching.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-21994?
CVE-2021-21994 is a critical authentication bypass vulnerability in Vmware Cloud Foundation, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-287
Which versions are affected by CVE-2021-21994?
It affects 2 products.
Products include Vmware Cloud Foundation, Vmware Esxi.
How do I fix CVE-2021-21994?
No fix has been published for CVE-2021-21994 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-21994 being exploited?
There is no known exploitation of CVE-2021-21994 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Vmware Cloud Foundation
- CVE-2024-38812 VMware vCenter Server Heap-Based Buffer Overflow
- CVE-2024-37079 Broadcom VMware vCenter Server Out-of-bounds Write
- CVE-2022-22954 VMware Workspace ONE Access and Identity Manager Server-Side Template Injection
- CVE-2021-22005 VMware vCenter Server File Upload
- CVE-2021-21985 VMware vCenter Server Improper Input Validation
Sources
Also known as GHSA-4643-h6pq-84f9.