CVE-2019-5181Public exploit

Code execution via oversized subnetmask value

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 through a crafted I/O-Check cache file. The iocheckd parser passes an oversized subnetmask XML value to sprintf(), which writes a generated configuration command beyond the 1,024-byte stack buffer at sp+0x440. Exploitation requires write access to /tmp/iocheckCache.xml and a BC_SaveParameter message; control of the overflow executes code in the service context, while a 0x3d9-byte value crashes the service.

CVSS severity8.8
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack buffer overflow in WAGO PFC200 firmware 03.02.02(14) allows local users to execute code through a crafted I/O-Check cache file. The iocheckd parser passes an oversized subnetmask XML value to sprintf(), which writes a generated configuration command beyond the 1,024-byte stack buffer at sp+0x440. Exploitation requires write access to /tmp/iocheckCache.xml and a BC_SaveParameter message; control of the overflow executes code in the service context, while a 0x3d9-byte value crashes the service.

The record

CVE
CVE-2019-5181
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
WAGO PFC200
Classifications
CWE-120, CWE-787, CAPEC-100, T1068
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787Out-of-bounds Write
CAPEC-100Overflow Buffers
T1068Exploitation for Privilege Escalation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo