Vulnerability record · CVE-2019-5081 · published 18 December 2019

CVE-2019-5081: Wago pfc 200 firmware out-of-bounds write vulnerability

Wago · Pfc 200 Firmware

An exploitable heap buffer overflow vulnerability exists in the iocheckd service ''I/O-Chec'' functionality of WAGO PFC 200 Firmware version 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 heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.

9.8 CVSS 3.1 Critical EPSS 4.5% · top 8.8% CWE-787 · Out-of-bounds write

9.8CVSS 3.1 base score, v2 10.0

4.5%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

4References, 4 tagged exploit

17 Jun 2026Last modified by NVD

Description

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

Affected products

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

Pfc 100 Firmware Wago

Pfc 200 Firmware Wago

References

Link	Tags
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0873	ExploitThird Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0874	ExploitThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0873	ExploitThird Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0874	ExploitThird 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%17 Dec 2020 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%18 Dec 2019 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%18 Dec 2019 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%18 Dec 2019 9.1CVE-2019-5078Wago 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 PFC200 Firmware versions 03.01.07(13)…EPSS 1.7%18 Dec 2019 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%18 Dec 2019 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%18 Dec 2019 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%18 Dec 2019

Source: NIST National Vulnerability Database (record CVE-2019-5081), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.