How severe is CVE-2016-8371?

CVE-2016-8371 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2016-8371 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-8371?

CVE-2016-8371 affects Phoenixcontact Ilc Plcs Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-8371?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-8371 published?

CVE-2016-8371 was published on 2018-04-05 and last updated on 2026-06-17.

CVE-2016-8371

CVE-2016-8371 is a high-severity vulnerability in Phoenixcontact Ilc Plcs Firmware with a CVSS 3.x base score of 7.3. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Phoenixcontact Ilc Plcs Firmware
Published: 2018-04-05
Last modified: 2026-06-17

Description

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

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.
How severe is CVE-2016-8371?: CVE-2016-8371 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2016-8371 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-8371?: CVE-2016-8371 affects Phoenixcontact Ilc Plcs Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-8371?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-8371 published?: CVE-2016-8371 was published on 2018-04-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:phoenixcontact:ilc_plcs_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Phoenixcontact Ilc Plcs Firmware

CVE-2016-8380 — High (CVSS 7.3): The web server in Phoenix Contact ILC PLCs allows access to read and write PLC variables without authentication.
CVE-2016-8366 — High (CVSS 7.3): Webvisit in Phoenix Contact ILC PLCs offers a password macro to protect HMI pages on the PLC against casual or…

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Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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