CVE-2019-5178Public exploit

Code execution via unchecked hostname formatting

Published Mar 11, 2020 · Updated Aug 4, 2024

Stack buffer overflow in WAGO PFC200 Firmware 03.02.02(14) allows local users to execute code via a crafted XML cache file. The iocheckd parser reads the hostname node from /tmp/iocheckCache.xml and passes it to sprintf into a fixed 1024-byte stack buffer without a length check. A local user must first write the cache file and then trigger parsing with a BC_SaveParameter message; successful exploitation controls execution, while the demonstrated payload crashes iocheckd.

CVSS severity8.8
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

Stack buffer overflow in WAGO PFC200 Firmware 03.02.02(14) allows local users to execute code via a crafted XML cache file. The iocheckd parser reads the hostname node from /tmp/iocheckCache.xml and passes it to sprintf into a fixed 1024-byte stack buffer without a length check. A local user must first write the cache file and then trigger parsing with a BC_SaveParameter message; successful exploitation controls execution, while the demonstrated payload crashes iocheckd.

The record

CVE
CVE-2019-5178
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
WAGO PFC200
Classifications
CWE-787, CWE-120
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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
8.8Cisco TalosCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/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.

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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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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