CVE-2019-5077

Name: CVE-2019-5077
Creator: NVD / NIST
Published: 2019-12-18T20:15:16.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.64%

Last modified Jun 17, 2026

CVE-2019-5077 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. An exploitable denial-of-service vulnerability exists in the iocheckd service ‘’I/O-Chec’’ functionality of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC 100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a denial of service, resulting in the device entering an error state where it ceases all network communications. EPSS estimates a 1.64% chance of exploitation in the next 30 days.

Description

An exploitable denial-of-service vulnerability exists in the iocheckd service ‘’I/O-Chec’’ functionality of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC 100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a denial of service, resulting in the device entering an error state where it ceases all network communications. An attacker can send unauthenticated packets to trigger this vulnerability.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS Probability

1.64%

73.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Wago	Pfc 200 Firmware	03.00.39\(12\)
Wago	Pfc 200 Firmware	03.01.07\(13\)
Wago	Pfc 100 Firmware	03.00.39\(12\)

References

https://talosintelligence.com/vulnerability_reports/TALOS-2019-0869Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0869Third Party Advisory

Timeline

Published: Dec 18, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-5077?

How severe is CVE-2019-5077?

CVE-2019-5077 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.64% probability of exploitation in the next 30 days.

How do I fix CVE-2019-5077?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-5077?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST