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Vulnerability record · CVE-2019-5078 · published 18 December 2019

CVE-2019-5078: Wago pfc 200 firmware missing authentication for critical function vulnerability

Wago · Pfc 200 Firmware

An exploitable denial of service vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 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.

9.1 CVSS 3.1 Critical EPSS 1.7% · top 24.4% CWE-306 · Missing authentication for critical function
9.1CVSS 3.1 base score, v2 9.4
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

An exploitable denial of service vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0870 Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0870 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-12522Wago pfc 100 firmware os command injection vulnerabilityThe reported vulnerability allows an attacker who has network access to the device to execute code with specially crafted packets in WAGO Series PFC …EPSS 3.1%9.8CVE-2019-5075Wago pfc 200 firmware out-of-bounds write vulnerabilityAn exploitable stack buffer overflow vulnerability exists in the command line utility getcouplerdetails of WAGO PFC200 Firmware versions 03.01.07(13)…EPSS 3.9%9.8CVE-2019-5079Wago pfc 200 firmware out-of-bounds write vulnerabilityAn exploitable heap buffer overflow vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(…EPSS 3.3%9.8CVE-2019-5074Wago pfc 200 firmware out-of-bounds write vulnerabilityAn exploitable stack buffer overflow vulnerability exists in the iocheckd service ''I/O-Check'' functionality of WAGO PFC200 Firmware version 03.01.0…EPSS 3.3%9.8CVE-2019-5081Wago pfc 200 firmware out-of-bounds write vulnerabilityAn exploitable heap buffer overflow vulnerability exists in the iocheckd service ''I/O-Chec'' functionality of WAGO PFC 200 Firmware version 03.01.07…EPSS 4.5%9.1CVE-2019-5080Wago pfc 200 firmware missing authentication for critical function vulnerabilityAn exploitable denial-of-service vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200 Firmware versions 03.01.07(13…EPSS 1.6%9.1CVE-2019-5077Wago pfc 200 firmware missing authentication for critical function vulnerabilityAn exploitable denial-of-service vulnerability exists in the iocheckd service ‘’I/O-Chec’’ functionality of WAGO PFC 200 Firmware versions 03.01.07(1…EPSS 1.6%5.3CVE-2019-5073Wago pfc 200 firmware information exposure vulnerabilityAn exploitable information exposure vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(…EPSS 1.6%

Source: NIST National Vulnerability Database (record CVE-2019-5078), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.