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Public proof of concept

CVE-2016-8371

A public proof of concept exists; no exploitation attested.

  • Published2018-04-05
  • WeaknessCWE-287 · CWE-592

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The web server in Phoenix Contact ILC PLCs can be accessed without authenticating even if the authentication mechanism is enabled.

Timeline

dates in UTC
  1. 2018-10-12Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-8371?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-8371?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Phoenixcontact ilc plcs firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-16-313-01 CISA1 known affected

    Phoenix Contact ILC PLC Authentication Vulnerabilities

    Phoenix Contact ILC 1xx PLCs: vers:all/*

Full record on NVD

Fix

  1. Mitigation from the vendor CISA ICSA-16-313-01 · 1 productPhoenix Contact has released an update for Webvisit to mitigate the plaintext password storage issue. Users may obtain this update by contacting Phoenix Contact customer support at (mailto:automation-service@phoenixcontact.com), or +49 52 81/9 46 28 88 Germany.
  2. Mitigation from the vendor CISA ICSA-16-313-01 · 1 productConnecting devices to a network via Ethernet always entails the risk of unauthorized access to the network. Phoenix Contact recommends that users implement an adequate defense–in-depth networking architecture (including the following) for control systems where these devices are operating: Devices s…
  3. Mitigation from the vendor CISA ICSA-16-313-01 · 1 productsuch as viruses, Trojans, phishing attacks. Users may decide to use the ILC 1x1 PLCs with the latest Firmware 4.42, because it offers the HTTPS protocol and HTML5 for the web server-based HMI system. With regard to the controller's communication interfaces, Phoenix Contact recommends not to use the…
  4. Mitigation from the vendor CISA ICSA-16-313-01 · 1 productFor more information on this vulnerability and the associated update and mitigation strategies, please email Phoenix Contact at the following address: (mailto:automation-service@phoenixcontact.com)

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-45590
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.07.3read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-592known since 2026-10-23
  • NVDweakness (CWE)CWE-287read 2026-10-23
  • FIRST EPSSEPSS score10.9 %read 2026-11-03
  • Exploit-DBdetectionread 2026-11-03
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
2018-04-05
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-vprp-wv7r-hv9r

Frequently asked questions

What is CVE-2016-8371?

The web server in Phoenix Contact ILC PLCs can be accessed without authenticating even if the authentication mechanism is enabled.

Is CVE-2016-8371 actively exploited?

Active exploitation of CVE-2016-8371 has not been confirmed. Its EPSS score was 10.9% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-8371?

CVE-2016-8371 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

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