CVE-2019-17639

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-15 · updated 2026-06-17
Weakness: CWE-843

Description

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.

Affected products

The Eclipse Foundation Eclipse OpenJ9: through 0.20.0; 0.21.0, 0.21.0-milestone1, 0.21.0-milestone2

References

https://bugs.eclipse.org/bugs/show_bug.cgi?id=563998
https://bugs.eclipse.org/bugs/show_bug.cgi?id=563998

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