CVE-2025-4447: In Eclipse OpenJ9 versions up to 0.51, when used with OpenJDK version 8 a stack based buffer overflow can be c

Routine

HIGH 7.8UPGRADE

CVE-2025-4447 is a high-severity flaw (CVSS 7.8) affecting openj9. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-121
Published	2025-05-09
Last modified	2026-06-17

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-09 21:15 UTCPublished CVE record published
2026-06-17 09:33 UTCUpdated Record last modified

eclipse openj9 UPGRADE

Affected: >= 0.8.0 and <= 0.51.0

Fixed in: newer than 0.51.0

Safe to downgrade to: a release before 0.8.0

1. Check installed version

apt-cache policy openj9 || rpm -q openj9 || openj9 --version

2. UPGRADE to newer than 0.51.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openj9

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openj9

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.8.0 (Debian / Ubuntu)

apt-cache madison openj9 sudo apt install openj9=<VERSION_BEFORE_0.8.0> sudo apt-mark hold openj9

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openj9 sudo dnf downgrade openj9-<VERSION_BEFORE_0.8.0> sudo dnf versionlock add openj9

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-4447?

openj9: upgrade to newer than 0.51.0. Exact commands for each OS are on this page.

Is CVE-2025-4447 being exploited?

CVE-2025-4447 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-4447 affect?

CVE-2025-4447 affects openj9. Severity is high (CVSS 7.8). 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.

How urgent is CVE-2025-4447?

Priority 31/100. High severity

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References

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