What is CVE-2017-7937?

CVE-2017-7937 is a medium-severity vulnerability in Phoenix Contact Gmbh Mguard, classified under Improper Authentication. CVSS score: 4.0/10. Published 2017-05-19.

How severe is CVE-2017-7937?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Auth bypass in Phoenix Contact Gmbh Mguard

CVE-2017-7937

An Improper Authentication issue was discovered in Phoenix Contact GmbH mGuard firmware versions 8.3.0 to 8.4.2. An attacker may be able to gain unauthorized access to the user firewall when RADIUS servers are unreachable.

Vulnerability class: Broken Authentication

Published 2017-05-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Phoenix Contact Gmbh Mguard
Phoenix Contact Gmbh Mguard Firmware — versions 8.3.0, 8.3.1, 8.3.2
Phoenix Contact Gmbh Mguard — versions Phoenix Contact GmbH mGuard

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

ics-cert.us-cert.gov/advisories/ICSA-17-131-01 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2017-7937?: CVE-2017-7937 is a medium-severity vulnerability in Phoenix Contact Gmbh Mguard, classified under Improper Authentication. CVSS score: 4.0/10. Published 2017-05-19.
How severe is CVE-2017-7937?: Medium severity. CVSS v3 base score is 4.0 out of 10.