CVE-2023-1108: A flaw was found in undertow

This month

HIGH 7.5REMOTEWATCHLISTMITIGATEDOWNGRADEDOWNGRADE

CVE-2023-1108 is a high-severity flaw (CVSS 7.5) affecting build of quarkus, decision manager, fuse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in undertow. This issue makes achieving a denial of service possible due to an unexpected handshake status updated in SslConduit, where the loop never terminates.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-835
Published	2023-09-14
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

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

Am I affected?

Timeline

2023-09-14 15:15 UTCPublished CVE record published
2026-06-17 05:27 UTCUpdated Record last modified

redhat build of quarkus MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy build-of-quarkus || rpm -q build-of-quarkus || build-of-quarkus --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat decision manager DOWNGRADE

Affected: 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

1. Check installed version

apt-cache policy decision-manager || rpm -q decision-manager || decision-manager --version

2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison decision-manager sudo apt install decision-manager=<VERSION_BEFORE_7.0> sudo apt-mark hold decision-manager

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

dnf --showduplicates list decision-manager sudo dnf downgrade decision-manager-<VERSION_BEFORE_7.0> sudo dnf versionlock add decision-manager

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 fuse DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison fuse sudo apt install fuse=<VERSION_BEFORE_1.0.0> sudo apt-mark hold fuse

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

dnf --showduplicates list fuse sudo dnf downgrade fuse-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add fuse

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 integration camel k MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy integration-camel-k || rpm -q integration-camel-k || integration-camel-k --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat integration service registry MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy integration-service-registry || rpm -q integration-service-registry || integration-service-registry --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat jboss enterprise application platform DOWNGRADE

Affected: all versions · 7.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.4

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 7.4 (Debian / Ubuntu)

apt-cache madison jboss-enterprise-application-platform sudo apt install jboss-enterprise-application-platform=<VERSION_BEFORE_7.4> 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_7.4> 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.

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-2023-1108?

build of quarkus: mitigate or apply the listed mitigation; decision manager: downgrade or apply the listed mitigation; fuse: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-1108 being exploited?

CVE-2023-1108 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-2023-1108 affect?

CVE-2023-1108 affects build of quarkus, decision manager, fuse. Severity is high (CVSS 7.5). A flaw was found in undertow. This issue makes achieving a denial of service possible due to an unexpected handshake status updated in SslConduit, where the loop never terminates.

How urgent is CVE-2023-1108?

Priority 56/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

JBoss and WildFly vulnerabilities

Related CVEs

CVE-2023-6394 HIGH 7.4 UPGRADE MITIGATE A flaw was found in Quarkus
CVE-2023-6393 MEDIUM 5.3 MITIGATE A flaw was found in the Quarkus Cache Runtime
CVE-2022-1011 HIGH 7.8 UPGRADE MITIGATE A use-after-free flaw was found in the Linux kernel’s FUSE filesystem in the way a user triggers write()
CVE-2023-4853 HIGH 8.1 UPGRADE DOWNGRADE A flaw was found in Quarkus where HTTP security policies are not sanitizing certain character permutations cor
CVE-2023-2974 MEDIUM 6.5 UPGRADE A vulnerability was found in quarkus-core

References

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