CVE-2017-5159
An issue was discovered on Phoenix Contact mGuard devices that have been updated to Version 8.4.0.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.43% probability · 84th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-99
- Affected
- phoenixcontact/mguard firmware
- Source
- ics-cert@hq.dhs.gov
EPSS 2.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/95648Third Party Advisory, VDB Entry
- https://ics-cert.us-cert.gov/advisories/ICSA-17-017-01Mitigation, Third Party Advisory, US Government Resource
- http://www.securityfocus.com/bid/95648Third Party Advisory, VDB Entry
- https://ics-cert.us-cert.gov/advisories/ICSA-17-017-01Mitigation, Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.