HOMEVULNERABILITIESCVE-2017-5159
CRITICAL

CVE-2017-5159

CWE-99Published: February 13, 2017· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2017-5159 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

phoenixcontact1 product(s)
mguard firmware
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttp://www.securityfocus.com/bid/95648
ADVISORYhttps://ics-cert.us-cert.gov/advisories/ICSA-17-017-01
ADVISORYhttp://www.securityfocus.com/bid/95648
ADVISORYhttps://ics-cert.us-cert.gov/advisories/ICSA-17-017-01

All References (4)

→
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

Quick Facts

CVE IDCVE-2017-5159
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-99
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 13, 2017

Related CVEs (CWE-99)

CVE-2022-1287
9.8
CVE-2025-43491
9.8
CVE-2025-2410
9.1
CVE-2024-57971
9.1
CVE-2025-0756
9.1
CVE-2022-3774
9.1

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-5159 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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