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CVE-2021-21994

CRITICALCVSS 9.8/10EPSS 1.16%

Last modified

CVE-2021-21994 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.16% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
1.16%

63.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
VmwareCloud Foundation>= 3.0, < 3.10.2
VmwareCloud Foundation>= 4.0, < 4.3
VmwareEsxi6.5
VmwareEsxi6.7
VmwareEsxi7.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-21994?
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.
How severe is CVE-2021-21994?
CVE-2021-21994 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.16% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21994?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21994?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST