CVE-2019-17639

What it is

In Eclipse OpenJ9 prior to version 0.21 on Power platforms, calling the System.arraycopy method with a length longer than the length of the source or destination array can, in certain specially crafted code patterns, cause the current method to return prematurely with an undefined return value. This allows whatever value happens to be in the return register at that time to be used as if it matches the method's declared return type.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

1.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-07-15 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.5% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-07-15 22:15 UTC

Last modified

2026-06-17 02:24 UTC

Exploit probability

1.5% · EPSS, next 30 days

Weakness

CWE-843

Record status

Modified

Affected

• Eclipse openj9 ≤ 0.20.0
• Eclipse openj9 0.21.0

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-17639.md and follow it. Check whether this project is affected by CVE-2019-17639. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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