CVE-2019-5186Network attack vector

Service crash via iocheckd stack overflow

Published Mar 23, 2020 · Updated Aug 4, 2024

Stack buffer overflow in WAGO PFC 200 firmware 03.02.02(14) allows attackers to crash the iocheckd service via a crafted packet. The I/O-Check parser copies an attacker-controlled interface element into a fixed stack buffer with sprintf(), then uses strcpy() on the adjacent corrupted buffer, causing invalid memory access when the value is sufficiently long. Reaching the condition requires network access to the service and a specially crafted cache packet; the demonstrated impact is service interruption, with no public evidence establishing code execution.

CVSS severity7.0
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in WAGO PFC 200 firmware 03.02.02(14) allows attackers to crash the iocheckd service via a crafted packet. The I/O-Check parser copies an attacker-controlled interface element into a fixed stack buffer with sprintf(), then uses strcpy() on the adjacent corrupted buffer, causing invalid memory access when the value is sufficiently long. Reaching the condition requires network access to the service and a specially crafted cache packet; the demonstrated impact is service interruption, with no public evidence establishing code execution.

The record

CVE
CVE-2019-5186
Published
Mar 23, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
PFC200 Controller
Classifications
CWE-787, CWE-120, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=WAGO PFC200 Firmware version 03.02.02(14)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WAGO · PFC200 Controllerversion=WAGO PFC200 Firmware version 03.02.02(14)

Published CVSS scores

4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P
7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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