CVE-2019-14423: A Remote Code Execution (RCE) issue in the addon CUx-Daemon 1.11a of the eQ-3 Homematic CCU-Firmware 2.35.16 u

Q: How do I fix CVE-2019-14423?

cux-daemon: upgrade to newer than 2.2.0; ccu2 firmware: upgrade to newer than 2.45.6. Exact commands for each OS are on this page.

Q: Is CVE-2019-14423 being exploited?

CVE-2019-14423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-14423 affect?

CVE-2019-14423 affects cux-daemon, ccu2 firmware. Severity is high (CVSS 8.8). A Remote Code Execution (RCE) issue in the addon CUx-Daemon 1.11a of the eQ-3 Homematic CCU-Firmware 2.35.16 until 2.45.6 allows remote authenticated attackers to execute system commands as root remotely via a simple HTTP request.

Q: How urgent is CVE-2019-14423?

Priority 60/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

This week

HIGH 8.8UPGRADEUPGRADE

CVE-2019-14423 is a high-severity flaw (CVSS 8.8) affecting cux-daemon, ccu2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Remote Code Execution (RCE) issue in the addon CUx-Daemon 1.11a of the eQ-3 Homematic CCU-Firmware 2.35.16 until 2.45.6 allows remote authenticated attackers to execute system commands as root remotely via a simple HTTP request.

Why this priority

High severity
EPSS top 3%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	19.9% (top 3%)
CISA exploited list	No
Weakness	CWE-78
Published	2019-10-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: eq-3

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

Am I affected?

Timeline

2019-10-17 14:15 UTCPublished CVE record published
2026-06-17 02:18 UTCUpdated Record last modified

eq-3 cux-daemon UPGRADE

Affected: >= 1.11a and <= 2.2.0

Fixed in: newer than 2.2.0

Safe to downgrade to: a release before 1.11a

1. Check installed version

apt-cache policy cux-daemon || rpm -q cux-daemon || cux-daemon --version

2. UPGRADE to newer than 2.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cux-daemon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cux-daemon

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 1.11a (Debian / Ubuntu)

apt-cache madison cux-daemon sudo apt install cux-daemon=<VERSION_BEFORE_1.11a> sudo apt-mark hold cux-daemon

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

dnf --showduplicates list cux-daemon sudo dnf downgrade cux-daemon-<VERSION_BEFORE_1.11a> sudo dnf versionlock add cux-daemon

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.

eq-3 ccu2 firmware UPGRADE

Affected: >= 2.35.16 and <= 2.45.6

Fixed in: newer than 2.45.6

Safe to downgrade to: a release before 2.35.16

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-2019-14423?

cux-daemon: upgrade to newer than 2.2.0; ccu2 firmware: upgrade to newer than 2.45.6. Exact commands for each OS are on this page.

Is CVE-2019-14423 being exploited?

CVE-2019-14423 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-2019-14423 affect?

CVE-2019-14423 affects cux-daemon, ccu2 firmware. Severity is high (CVSS 8.8). A Remote Code Execution (RCE) issue in the addon CUx-Daemon 1.11a of the eQ-3 Homematic CCU-Firmware 2.35.16 until 2.45.6 allows remote authenticated attackers to execute system commands as root remotely via a simple HTTP request.

How urgent is CVE-2019-14423?

Priority 60/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2019-14424 MEDIUM 6.5 UPGRADE UPGRADE A Local File Inclusion (LFI) issue in the addon CUx-Daemon 1.11a of the eQ-3 Homematic CCU-Firmware 2.35.16 un

References

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