CVE-2018-7300: Directory Traversal / Arbitrary File Write / Remote Code Execution in the User.setLanguage method in eQ-3 AG H

Q: How do I fix CVE-2018-7300?

homematic ccu2 firmware: upgrade to newer than 2.29.22. Exact commands for each OS are on this page.

Q: Is CVE-2018-7300 being exploited?

CVE-2018-7300 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-2018-7300 affect?

CVE-2018-7300 affects homematic ccu2 firmware. Severity is critical (CVSS 9.8). Directory Traversal / Arbitrary File Write / Remote Code Execution in the User.setLanguage method in eQ-3 AG Homematic CCU2 2.29.2 and earlier allows remote attackers to write arbitrary files to the device's filesystem. This vulnerability c

Q: How urgent is CVE-2018-7300?

Priority 69/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-7300 is a critical-severity flaw (CVSS 9.8) affecting homematic ccu2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory Traversal / Arbitrary File Write / Remote Code Execution in the User.setLanguage method in eQ-3 AG Homematic CCU2 2.29.2 and earlier allows remote attackers to write arbitrary files to the device's filesystem. This vulnerability can be exploited by unauthenticated attackers with access to the web interface.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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	30.6% (top 2%)
CISA exploited list	No
Weakness	CWE-22
Published	2018-02-22
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

2018-02-22 19:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

eq-3 homematic ccu2 firmware UPGRADE

Affected: <= 2.29.22

Fixed in: newer than 2.29.22

Safe to downgrade to: no unaffected older release

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Homematic CCU2 2.29.23 - Arbitrary File Write

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-2018-7300?

homematic ccu2 firmware: upgrade to newer than 2.29.22. Exact commands for each OS are on this page.

Is CVE-2018-7300 being exploited?

CVE-2018-7300 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-2018-7300 affect?

CVE-2018-7300 affects homematic ccu2 firmware. Severity is critical (CVSS 9.8). Directory Traversal / Arbitrary File Write / Remote Code Execution in the User.setLanguage method in eQ-3 AG Homematic CCU2 2.29.2 and earlier allows remote attackers to write arbitrary files to the device's filesystem. This vulnerability c

How urgent is CVE-2018-7300?

Priority 69/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2019-9584 CRITICAL 9.8 UPGRADE UPGRADE eQ-3 Homematic AddOn 'CloudMatic' on CCU2 and CCU3 allows uncontrolled admin access, resulting in the ability
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References

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