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CVE-2018-8088: org.slf4j.ext.EventData in the slf4j-ext module in QOS.CH SLF4J before 1.8.0-beta2 allows remote attackers to

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CRITICAL 9.8REMOTEWATCHLISTUPGRADEDOWNGRADEDOWNGRADE

CVE-2018-8088 is a critical-severity flaw (CVSS 9.8) affecting slf4j, jboss enterprise application platform, virtualization. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

org.slf4j.ext.EventData in the slf4j-ext module in QOS.CH SLF4J before 1.8.0-beta2 allows remote attackers to bypass intended access restrictions via crafted data. EventData in the slf4j-ext module in QOS.CH SLF4J, has been fixed in SLF4J versions 1.7.26 later and in the 2.0.x series.

Why this priority

  • Critical severity
  • EPSS top 3%: very likely to be exploited
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance14.7% (top 3%)
CISA exploited listNo
Published2018-03-20
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: qos · redhat

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

Am I affected?

Timeline

qos slf4j UPGRADE
Affected: < 1.7.26 · 1.8.0 alpha1 · 1.8.0 alpha2 · 1.8.0 beta1 · 1.8.0 beta2
Fixed in: 1.7.26
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy slf4j || rpm -q slf4j || slf4j --version
2. UPGRADE to 1.7.26 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade slf4j
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade slf4j
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat jboss enterprise application platform DOWNGRADE
Affected: 7.1 · 6.0.0 · 6.4.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy jboss-enterprise-application-platform || rpm -q jboss-enterprise-application-platform || jboss-enterprise-application-platform --version
2. No fixed release: DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)
apt-cache madison jboss-enterprise-application-platform sudo apt install jboss-enterprise-application-platform=<VERSION_BEFORE_6.0.0> sudo apt-mark hold jboss-enterprise-application-platform
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jboss-enterprise-application-platform sudo dnf downgrade jboss-enterprise-application-platform-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add jboss-enterprise-application-platform
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 virtualization DOWNGRADE
Affected: 4.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.0
1. Check installed version
apt-cache policy virtualization || rpm -q virtualization || virtualization --version
2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)
apt-cache madison virtualization sudo apt install virtualization=<VERSION_BEFORE_4.0> sudo apt-mark hold virtualization
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list virtualization sudo dnf downgrade virtualization-<VERSION_BEFORE_4.0> sudo dnf versionlock add virtualization
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 virtualization host DOWNGRADE
Affected: 4.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.0
1. Check installed version
apt-cache policy virtualization-host || rpm -q virtualization-host || virtualization-host --version
2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)
apt-cache madison virtualization-host sudo apt install virtualization-host=<VERSION_BEFORE_4.0> sudo apt-mark hold virtualization-host
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list virtualization-host sudo dnf downgrade virtualization-host-<VERSION_BEFORE_4.0> sudo dnf versionlock add virtualization-host
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: 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
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 eus MITIGATE
Affected: 7.4 · 7.5 · 7.6 · 7.7
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.4
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.
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-2018-8088?

slf4j: upgrade to 1.7.26; jboss enterprise application platform: downgrade or apply the listed mitigation; virtualization: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-8088 being exploited?

CVE-2018-8088 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-2018-8088 affect?

CVE-2018-8088 affects slf4j, jboss enterprise application platform, virtualization. Severity is critical (CVSS 9.8). org.slf4j.ext.EventData in the slf4j-ext module in QOS.CH SLF4J before 1.8.0-beta2 allows remote attackers to bypass intended access restrictions via crafted data. EventData in the slf4j-ext module in QOS.CH SLF4J, has been fixed in SLF4J v

How urgent is CVE-2018-8088?

Priority 68/100. Critical severity; EPSS top 3%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

JBoss and WildFly vulnerabilities

References

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