CVE-2019-5179

Code execution via iocheckd cache parsing

Published Mar 11, 2020 · Updated Aug 4, 2024

A stack buffer overflow in WAGO PFC200 Firmware 03.02.02(14) allows local users to execute code via a crafted I/O-Check cache file and packet. The iocheckd service parses /tmp/iocheckCache.xml, which is globally writable, and copies attacker-controlled XML parameters into stack buffers when processing a BC_SaveParameter message. Exploitation requires the ability to write the cache file and reach the controller's I/O-Check service; successful exploitation can compromise confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack buffer overflow in WAGO PFC200 Firmware 03.02.02(14) allows local users to execute code via a crafted I/O-Check cache file and packet. The iocheckd service parses /tmp/iocheckCache.xml, which is globally writable, and copies attacker-controlled XML parameters into stack buffers when processing a BC_SaveParameter message. Exploitation requires the ability to write the cache file and reach the controller's I/O-Check service; successful exploitation can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2019-5179
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
WAGO PFC200
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 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=Firmware version 03.02.02(14)

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

WAGO · WAGO PFC200version=Firmware version 03.02.02(14)

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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.

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No observations available

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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