How severe is CVE-2019-18938?

CVE-2019-18938 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18938 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18938?

CVE-2019-18938 primarily affects Hm Email Project Hm Email. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18938?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-18938 published?

CVE-2019-18938 was published on 2019-11-14 and last updated on 2026-06-17.

CVE-2019-18938

CVE-2019-18938 is a critical-severity vulnerability in Hm Email Project Hm Email with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 34% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 34% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Hm Email Project Hm Email
Published: 2019-11-14
Last modified: 2026-06-17

Description

eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the E-Mail AddOn through 1.6.8.c installed allow Remote Code Execution by unauthenticated attackers with access to the web interface via the save.cgi script for payload upload and the testtcl.cgi script for its execution.

Frequently asked questions

What is CVE-2019-18938?: eQ-3 Homematic CCU2 2.47.20 and CCU3 3.47.18 with the E-Mail AddOn through 1.6.8.c installed allow Remote Code Execution by unauthenticated attackers with access to the web interface via the save.cgi script for payload upload and the testtcl.cgi script for its execution.
How severe is CVE-2019-18938?: CVE-2019-18938 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18938 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18938?: CVE-2019-18938 primarily affects Hm Email Project Hm Email. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18938?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-18938 published?: CVE-2019-18938 was published on 2019-11-14 and last updated on 2026-06-17.

References

https://psytester.github.io/CVE-2019-18938/

Affected products (16)

cpe:2.3:a:hm_email_project:hm_email:1.6.8c:*:*:*:*:*:*:*
cpe:2.3:o:eq-3:homematic_ccu2_firmware:2.24.20:*:*:*:*:*:*:*
cpe:2.3:o:eq-3:homematic_ccu3_firmware:3.47.18:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.8b:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.8a:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.7c:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.7b:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.7a:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.7:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.6:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.5:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.4:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.3:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.2:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.0:*:*:*:*:*:*:*
cpe:2.3:a:hm_email_project:hm_email:1.6.8:*:*:*:*:*:*:*

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