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Security Bulletin: Multiple Vulnerabilities in VMware ESXi affect IBM Cloud Pak System (CVE-2021-21994, CVE-2021-21995)

Security Bulletin


Vulnerabilties in VMware ESXi affect IBM Cloud Pak System. IBM Cloud Pak System has addressed these vulnerabilities.

Vulnerability Details

CVEID:   CVE-2021-21994
DESCRIPTION:   VMware ESXI could allow a remote attacker to bypass security restrictions, caused by improper authentication in SFCB. By sending a specially crafted request, an attacker could exploit this vulnerability to bypass SFCB authentication.
CVSS Base score: 7
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L)

CVEID:   CVE-2021-21995
DESCRIPTION:   VMware ESXI is vulnerable to a denial of service, caused by a heap out-of-bounds read in OpenSLP. A remote attacker with access to port 427 could exploit this vulnerability to cause a denial of service.
CVSS Base score: 5.3
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Cloud Pak System

V2.3.0.1, V., v.

IBM Cloud Pak System

v2.3.3.0 v., v., v., v2.3.3.3 iFix 1



 For unsupported or end of life release recommendation is to upgrade to uspported fixed release of the product.

 In response to vulnerabilities found in VMware ESXi, Cloud Pak System provides new ESXi Image update to latest  ESXi 6.7 EP 23 (build 19195723) that covers also CVE-2021-22045, along with  Cloud Pak System  

 For IBM Cloud Pak System V2.3.0.1, V., v., v2.3.3.0, v., v., v., v2.3.3.3 iFix 1

      upgrade to IBM Cloud Pak System v2.3.3.4

 Information on upgrading can be found here:


Workarounds and Mitigations


Get Notified about Future Security Bulletins




Change History

09 Sep 2021: Initial Publication
09 May 2022: Release Update

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location


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Document Information

Modified date:
10 May 2022