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Security Bulletin: IBM Java SDK and IBM Java Runtime for IBM i are vulnerable to a denial of service and bypassing security restrictions due to multiple vulnerabilities.

Security Bulletin


IBM® SDK Java™ Technology Edition and IBM® Runtime Environment Java™ used by IBM i are vulnerable to a remote attacker causing availability impact (CVE-2024-21085), denial of service (CVE-2023-38264), and bypassing security restrictions (CVE-2024-3933) as described in the vulnerability details section. This bulletin identifies the steps to take to address the vulnerabilities as described in the remediation/fixes section.

Vulnerability Details

CVEID:   CVE-2024-21085
DESCRIPTION:   An unspecified vulnerability in Java SE related to the VM component could allow a remote attacker to cause low availability impacts.
CVSS Base score: 3.7
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID:   CVE-2023-38264
DESCRIPTION:   The IBM SDK, Java Technology Edition's Object Request Broker (ORB) through and through is vulnerable to a denial of service attack in some circumstances due to improper enforcement of the JEP 290 MaxRef and MaxDepth deserialization filters. IBM X-Force ID: 260578.
CVSS Base score: 5.9
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:   CVE-2024-3933
DESCRIPTION:   Eclipse Openj9 could allow a local authenticated attacker to bypass security restrictions, caused by the failure to restrict access to a buffer with an incorrect length value when executing an arraycopy sequence while the Concurrent Scavenge Garbage Collection cycle is active and the source and destination memory regions for arraycopy overlap. By sending a specially crafted request, an attacker could exploit this vulnerability to gain read and write to addresses beyond the end of the array range.
CVSS Base score: 5.3
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L)

Affected Products and Versions


Affected Product(s)Version(s)
IBM i7.5
IBM i7.4
IBM i7.3


The vulnerabilities can be fixed by applying the latest Java PTF Group.  Releases 7.5, 7.4, and 7.3, of IBM i will be fixed.

The IBM i PTF Group numbers contain the fixes for the vulnerabilities.  Future PTF Groups for Java will also contain the fixes for the vulnerabilities.

IBM i Release5770-JV1 PTF Group Number and LevelPTF Download Link

SF99955 Level 10


SF99665 Level 23


SF99725 Level 33


Please see the Java document at this URL for the latest Java information for IBM i:

If you run your own Java code using the IBM Java Runtime delivered with this product, you should evaluate your code to determine whether additional Java vulnerabilities are applicable to your code. For a complete list of vulnerabilities, refer to the "IBM Java SDK Security Vulnerabilities", located in the References section for more information.

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations


Get Notified about Future Security Bulletins




Change History

09 Jul 2024: 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.


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:
09 July 2024