CVE-2019-18939

Name: CVE-2019-18939
Creator: NVD / NIST
Published: 2019-11-14T19:15:13.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 40.78%

Last modified Jun 17, 2026

CVE-2019-18939 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the HM-Print AddOn through 1.2a installed allow Remote Code Execution by unauthenticated attackers with access to the web interface via the exec.cgi and exec1.cgi scripts, which execute TCL script content from an HTTP POST request.. EPSS estimates a 40.78% chance of exploitation in the next 30 days.

Description

eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the HM-Print AddOn through 1.2a installed allow Remote Code Execution by unauthenticated attackers with access to the web interface via the exec.cgi and exec1.cgi scripts, which execute TCL script content from an HTTP POST request.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

40.78%

98.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Hm-Print Project	Hm-Print	1.2a
Eq-3	Homematic Ccu2 Firmware	2.47.20
Hm-Print Project	Hm-Print	1.2
Eq-3	Homematic Ccu3 Firmware	3.47.18

References

https://psytester.github.io/CVE-2019-18939/Exploit, Third Party Advisory
https://psytester.github.io/CVE-2019-18939/Exploit, Third Party Advisory

Timeline

Published: Nov 14, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18939?

How severe is CVE-2019-18939?

CVE-2019-18939 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 40.78% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18939?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18939?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST