CVE-2018-12547: In Eclipse OpenJ9, prior to the 0.12.0 release, the jio_snprintf() and jio_vsnprintf() native methods ignored

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEDOWNGRADEMITIGATE

CVE-2018-12547 is a critical-severity flaw (CVSS 9.8) affecting openj9, satellite, enterprise linux desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Eclipse OpenJ9, prior to the 0.12.0 release, the jio_snprintf() and jio_vsnprintf() native methods ignored the length parameter. This affects existing APIs that called the functions to exceed the allocated buffer. This functions were not directly callable by non-native user code.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-20, CWE-119
Published	2019-02-11
Last modified	2026-06-17

Publisher (CNA): Eclipse Foundation · Vendor: eclipse · redhat

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

Am I affected?

Timeline

2019-02-11 15:29 UTCPublished CVE record published
2026-06-17 01:37 UTCUpdated Record last modified

eclipse openj9 UPGRADE

Affected: < 0.12.0

Fixed in: 0.12.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.12.0 (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.

redhat satellite DOWNGRADE

Affected: 5.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.8 (Debian / Ubuntu)

apt-cache madison satellite sudo apt install satellite=<VERSION_BEFORE_5.8> sudo apt-mark hold satellite

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list satellite sudo dnf downgrade satellite-<VERSION_BEFORE_5.8> sudo dnf versionlock add satellite

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.

redhat enterprise linux desktop MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux server MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux workstation MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · copyparty · FIXED · 1.20.26-1.fc46 · FEDORA-2026-8fbe18458e · source

sudo dnf upgrade --advisory=FEDORA-2026-8fbe18458e

Fedora ELN · man-pages · FIXED · 6.20-1.eln159 · FEDORA-2026-f1f5fb11b4 · source

sudo dnf upgrade --advisory=FEDORA-2026-f1f5fb11b4

RHEL 6 Supplementary · java-1.8.0-ibm · FIXED · java-1.8.0-ibm-1.8.0.5.30-1jpp.1.el6_10

sudo dnf upgrade --advisory=RHSA-2019:0469 rpm -q java-1.8.0-ibm

RHEL 6 Supplementary · java-1.7.1-ibm · FIXED · java-1.7.1-ibm-1.7.1.4.40-1jpp.1.el6_10

sudo dnf upgrade --advisory=RHSA-2019:0474 rpm -q java-1.7.1-ibm

RHEL 7 Supplementary · java-1.8.0-ibm · FIXED · java-1.8.0-ibm-1.8.0.5.30-1jpp.1.el7

sudo dnf upgrade --advisory=RHSA-2019:0472 rpm -q java-1.8.0-ibm

RHEL 7 Supplementary · java-1.7.1-ibm · FIXED · java-1.7.1-ibm-1.7.1.4.40-1jpp.1.el7

sudo dnf upgrade --advisory=RHSA-2019:0473 rpm -q java-1.7.1-ibm

RHEL 8 · java-1.8.0-ibm · FIXED · java-1.8.0-ibm-1.8.0.5.35-3.el8_0

sudo dnf upgrade --advisory=RHSA-2019:1238 rpm -q java-1.8.0-ibm

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-2018-12547?

openj9: upgrade to 0.12.0; satellite: downgrade or apply the listed mitigation; enterprise linux desktop: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-12547 being exploited?

CVE-2018-12547 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-2018-12547 affect?

CVE-2018-12547 affects openj9, satellite, enterprise linux desktop. Severity is critical (CVSS 9.8). In Eclipse OpenJ9, prior to the 0.12.0 release, the jio_snprintf() and jio_vsnprintf() native methods ignored the length parameter. This affects existing APIs that called the functions to exceed the allocated buffer. This functions were not

How urgent is CVE-2018-12547?

Priority 71/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

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References

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