How severe is CVE-2017-5159?

CVE-2017-5159 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-2017-5159 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-5159?

CVE-2017-5159 affects Phoenixcontact Mguard Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-5159?

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-2017-5159 published?

CVE-2017-5159 was published on 2017-02-13 and last updated on 2026-06-17.

CVE-2017-5159

CVE-2017-5159 is a critical-severity vulnerability in Phoenixcontact Mguard Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-99.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-99
Affected product: Phoenixcontact Mguard Firmware
Published: 2017-02-13
Last modified: 2026-06-17

Description

An issue was discovered on Phoenix Contact mGuard devices that have been updated to Version 8.4.0. When updating an mGuard device to Version 8.4.0 via the update-upload facility, the update will succeed, but it will reset the password of the admin user to its default value.

Frequently asked questions

What is CVE-2017-5159?: An issue was discovered on Phoenix Contact mGuard devices that have been updated to Version 8.4.0. When updating an mGuard device to Version 8.4.0 via the update-upload facility, the update will succeed, but it will reset the password of the admin user to its default value.
How severe is CVE-2017-5159?: CVE-2017-5159 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-2017-5159 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-5159?: CVE-2017-5159 affects Phoenixcontact Mguard Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-5159?: 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-2017-5159 published?: CVE-2017-5159 was published on 2017-02-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:phoenixcontact:mguard_firmware:8.4.0:*:*:*:*:*:*:*

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