Multiple vulnerabilities in VMware ESXi)



Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-21994
CVE-2021-21995
CWE-ID CWE-287
CWE-125
Exploitation vector Network
Public exploit N/A
Vulnerable software
 VMware ESXi
Operating systems & Components / Operating system

Vendor VMware, Inc

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authentication

EUVDB-ID: #VU54814

Risk: High

CVSSv4.0: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-21994

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests in SFCB (Small Footprint CIM Broker). A remote attacker can send specially crafted requests to port 5989/tcp, bypass SFCB authentication and gain unauthorized access to the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

VMware ESXi: ESXi_7.0.0-1.20.16321839 - 7.0

CPE2.3 External links

https://www.vmware.com/security/advisories/VMSA-2021-0014.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds read

EUVDB-ID: #VU54816

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-21995

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when processing requests within the OpenSLP service. A remote attacker can send a specially crafted request to port 427/UDP, trigger a heap out-of-bounds read and perform a denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

VMware ESXi: ESXi_7.0.0-1.20.16321839 - 7.0

CPE2.3 External links

https://www.vmware.com/security/advisories/VMSA-2021-0014.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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