Security Bulletin
Summary
Communications Server (CS) for Data Center Deployment, CS for Linux, and CS for Linux on System z install a local Java JRE in its product directories. This JRE is used solely for the IBM Key Manager (ikeyman) tool which is called by the snakeyman script used for managing the SSL key database used by the TN3270 Server and TN Redirector functions. This Java JRE is not intended to be used for any other purpose.
Vulnerability Details
CVEID: CVE-2025-21587
DESCRIPTION: An unspecified vulnerability in Java SE related to the Server: DDL component could allow a remote attacker to cause high confidentiality and high integrity impact.
CWE: CWE-284: Improper Access Control
CVSS Source: secalert_us@oracle.com
CVSS Base score: 7.4
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
CVEID: CVE-2025-30698
DESCRIPTION: An unspecified vulnerability in Java SE related to the 2D component could allow a remote attacker to cause low confidentiality, low integrity and low availability impact.
CWE: CWE-284: Improper Access Control
CVSS Source: secalert_us@oracle.com
CVSS Base score: 5.6
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2025-4447
DESCRIPTION: In Eclipse OpenJ9 versions up to 0.51, when used with OpenJDK version 8 a stack based buffer overflow can be caused by modifying a file on disk that is read when the JVM starts.
CWE: CWE-121: Stack-based Buffer Overflow
CVSS Source: NVD
CVSS Base score: 7.8
CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Communications Server for Linux | 6.4 |
| Communications Server for Linux on System z | 6.4 |
| Communications Server for Data Center Deployment | 7.0 - 7.1 |
Remediation/Fixes
N/A
Workarounds and Mitigations
IBM strongly recommends addressing the vulnerability now by executing these steps.
| Product(s) | Version(s) | Remediation/Fix/Instructions |
| Communications Server for Linux | 6.4 |
This applies to all products/versions listed. 1) Do not use this Java JRE for any purpose other than the intended use with the snakeyman/ikeyman key database management utility. Use the system Java for any other purpose. 2) If you are not using the TN3270 Server or TN Redirector functions, or if not using SSL with those functions, this Java can be removed. cd /opt/ibm/sna ; rm -rf "ibm-java-$(uname -m)-80" 3) If SSL is in use with these functions, an available non-java command line management tool is gsk8capicmd provided with IBM GSKit, which is installed as a prerequisite for those functions. Beginning with the CS DCD 7.1.1.1 update, a shell script "snacertman" is included to provide a menu driven interface to the gsk8capicmd. Link to gsk8capicmd documentation: |
| Communications Server for Linux on System z | 6.4 | |
| Communications Server for Data Center Development | 7.0 - 7.1 |
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References
Acknowledgement
Change History
19 Mar 2026: 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
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Document Information
Modified date:
19 March 2026
Initial Publish date:
19 March 2026
UID
ibm17266903