## Summary

There is a vulnerability in IBM® Runtime Environment Java™ Version 8 used by IBM CPLEX Optimization Studio. IBM CPLEX Optimization Studio has addressed the applicable CVE.

## Vulnerability Details

** CVEID: **[CVE-2021-28167]()
** DESCRIPTION: **Eclipse Openj9 could allow a remote attacker to bypass security restrictions, caused by a flaw in the jdk.internal.reflect.ConstantPool API. By sending a specially-crafted request, an attacker could exploit this vulnerability to call static methods or access static members without running the class initialization method.
CVSS Base score: 6.5
CVSS Temporal Score: See: [ https://exchange.xforce.ibmcloud.com/vulnerabilities/200533]() for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)

## Affected Products and Versions

Affected Product(s)| Version(s)
—|—
IBM ILOG CPLEX Optimization Studio (COS)| 22.1
IBM ILOG CPLEX Optimization Studio (COS)| 20.1.0.1
IBM ILOG CPLEX Optimization Studio (COS)| 20.1
IBM ILOG CPLEX Optimization Studio (COS)| 12.10
IBM ILOG CPLEX Optimization Studio (COS)| 12.9
IBM ILOG CPLEX Optimization Studio (COS)| 12.8

## Remediation/Fixes

The recommended solution is to download and install the appropriate version of IBM JRE as soon as practicable.

Before installing a newer version of IBM JRE, please ensure that you:

* Close any open programs that you may have running;
* Rename the initial directory of the IBM JRE (for example: with a .old at the end),
* Download and install the appropriate IBM JRE version.

**IBM ILOG CPLEX Optimization Studio :**

[IBM JRE Version 8 Service Refresh 7 Fix Pack 20]() and subsequent releases

You must verify that applying this fix does not cause any compatibility issues.
[Here are the detailed instructions]() for updating IBM JRE.

_For macOS, IBM recommends upgrading to a fixed, supported version/release/platform of the product._

## Workarounds and Mitigations

None

## Get Notified about Future Security Bulletins

Subscribe to [My Notifications]() to be notified of important product support alerts like this.

### References

[Complete CVSS v3 Guide]( “Link resides outside of ibm.com” )
[On-line Calculator v3]( “Link resides outside of ibm.com” )

Off

[Security Bulletin: CVE-2021-28167 may affect IBM® SDK, Java™ Technology Edition]( “Security Bulletin: CVE-2021-28167 may affect IBM® SDK, Java™ Technology Edition” )

## Related Information

[IBM Secure Engineering Web Portal]()
[IBM Product Security Incident Response Blog]()

## Change History

24 Nov 2022: Initial Publication

*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.

## Disclaimer

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

Worldwide

[{“Business Unit”:{“code”:”BU059″,”label”:”IBM Software w/o TPS”},”Product”:{“code”:”SSSA5P”,”label”:”IBM ILOG CPLEX Optimization Studio”},”Component”:””,”Platform”:[{“code”:”PF002″,”label”:”AIX”},{“code”:”PF016″,”label”:”Linux”},{“code”:”PF033″,”label”:”Windows”}],”Version”:”12.8,12.9,12.10,20.1,20.1.0.1,22.1″,”Edition”:”All”,”Line of Business”:{“code”:”LOB10″,”label”:”Data and AI”}}]Read More