PatchTheCVECVE-2021-4178: A arbitrary code execution flaw was found in the Fabric 8 Kubernetes client affecting versions 5.0.0-beta-1 an
35
Routine
MEDIUM 6.7WATCHLISTUPGRADEDOWNGRADEDOWNGRADE
CVE-2021-4178 is a medium-severity flaw (CVSS 6.7) affecting fabric8-kubernetes, a-mq streams, build of quarkus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A arbitrary code execution flaw was found in the Fabric 8 Kubernetes client affecting versions 5.0.0-beta-1 and above. Due to an improperly configured YAML parsing, this will allow a local and privileged attacker to supply malicious YAML.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.7 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 73%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2022-08-24 |
| 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
- Published CVE record published
- Updated Record last modified
redhat fabric8-kubernetes UPGRADE
Affected: >= 5.0.1 and < 5.0.3 · >= 5.1.0 and < 5.1.2 · >= 5.2.0 and < 5.3.2 · >= 5.5.0 and < 5.7.4 · >= 5.9.0 and < 5.10.2 · >= 5.11.0 and < 5.11.2 · 5.0.0 beta1 · 5.8.0
Fixed in: 5.0.3, 5.1.2, 5.3.2, 5.7.4, 5.10.2, 5.11.2
Safe to downgrade to: a release before 5.0.0
1. Check installed version
apt-cache policy fabric8-kubernetes || rpm -q fabric8-kubernetes || fabric8-kubernetes --version
2. UPGRADE to 5.0.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fabric8-kubernetes
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fabric8-kubernetes
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 5.0.0 (Debian / Ubuntu)
apt-cache madison fabric8-kubernetes
sudo apt install fabric8-kubernetes=<VERSION_BEFORE_5.0.0>
sudo apt-mark hold fabric8-kubernetes
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fabric8-kubernetes
sudo dnf downgrade fabric8-kubernetes-<VERSION_BEFORE_5.0.0>
sudo dnf versionlock add fabric8-kubernetes
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 a-mq streams DOWNGRADE
Affected: 2.0.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.0.1
1. Check installed version
apt-cache policy a-mq-streams || rpm -q a-mq-streams || a-mq-streams --version
2. No fixed release: DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)
apt-cache madison a-mq-streams
sudo apt install a-mq-streams=<VERSION_BEFORE_2.0.1>
sudo apt-mark hold a-mq-streams
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list a-mq-streams
sudo dnf downgrade a-mq-streams-<VERSION_BEFORE_2.0.1>
sudo dnf versionlock add a-mq-streams
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 build of quarkus DOWNGRADE
Affected: 2.2.5
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.2.5
1. Check installed version
apt-cache policy build-of-quarkus || rpm -q build-of-quarkus || build-of-quarkus --version
2. No fixed release: DOWNGRADE to a release before 2.2.5 (Debian / Ubuntu)
apt-cache madison build-of-quarkus
sudo apt install build-of-quarkus=<VERSION_BEFORE_2.2.5>
sudo apt-mark hold build-of-quarkus
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list build-of-quarkus
sudo dnf downgrade build-of-quarkus-<VERSION_BEFORE_2.2.5>
sudo dnf versionlock add build-of-quarkus
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 descision 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 descision-manager || rpm -q descision-manager || descision-manager --version
2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)
apt-cache madison descision-manager
sudo apt install descision-manager=<VERSION_BEFORE_7.0>
sudo apt-mark hold descision-manager
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list descision-manager
sudo dnf downgrade descision-manager-<VERSION_BEFORE_7.0>
sudo dnf versionlock add descision-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: 7.11
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.11
1. Check installed version
apt-cache policy fuse || rpm -q fuse || fuse --version
2. No fixed release: DOWNGRADE to a release before 7.11 (Debian / Ubuntu)
apt-cache madison fuse
sudo apt install fuse=<VERSION_BEFORE_7.11>
sudo apt-mark hold fuse
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fuse
sudo dnf downgrade fuse-<VERSION_BEFORE_7.11>
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.
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.
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-2021-4178?
fabric8-kubernetes: upgrade to 5.0.3, 5.1.2, 5.3.2, 5.7.4, 5.10.2, 5.11.2; a-mq streams: downgrade or apply the listed mitigation; build of quarkus: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-4178 being exploited?
CVE-2021-4178 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-2021-4178 affect?
CVE-2021-4178 affects fabric8-kubernetes, a-mq streams, build of quarkus. Severity is medium (CVSS 6.7). A arbitrary code execution flaw was found in the Fabric 8 Kubernetes client affecting versions 5.0.0-beta-1 and above. Due to an improperly configured YAML parsing, this will allow a local and privileged attacker to supply malicious YAML.
How urgent is CVE-2021-4178?
Priority 35/100. On your watchlist