CVE-2019-5176

lowpriority · track · 22EPSS 0.005 · 44 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.53% (44th) EPSS

CVSS 2.1 · low

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · wago_psirt

EPSS · scored 2026-10-27

An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service ‘I/O-Check’ functionality of WAGO PFC 200 Firmware version 03.02.02(14). An attacker can send a specially crafted packet to trigger the parsing of this cache file.The destination buffer sp+0x40 is overflowed with the call to sprintf() for any gateway values that are greater than 512-len(‘/etc/config-tools/config_default_gateway number=0 state=enabled value=‘) in length. A gateway value of length 0x7e2 will cause the service to crash.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedwago_psirt
The I/O-Check service protocol is only needed during installation and commissioning, not during normal operations. It is highly recommended to disable the I/O-Check service after commissioning. This is the easiest and securest way to protect your device from the listed vulnerabilities. Regardless of the action described above, the vulnerabilities are expected to be fixed in FW16 Release in Q2/2020.
Mitigationwago_psirt
* Disable I/O-Check service. * Restrict network access to the device. * Do not directly connect the device to the internet. * Disable unused TCP/UDP-ports.

cvss

Technical severity, 0–10. One row per scoring source.

5.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–5.5

v2.02.1lowAV:L/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 3.6

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · WAGO PSIRT DE

v3.15.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-787US

affected products (7)

Products and version ranges known to be affected.

WAGO WAGO PFC200≤ Firmware version 03.02.02(14)enisa_euvdEU
wago pfc200 firmware= 03.02.02(14)nvdUScpe:2.3:o:wago:pfc200_firmware:*:*:*:*:*:*:*:*
Firmware <FW16 installed on Hardware 750-81xx/xxx-xxx (PFC100)all versionswago_psirtDE
Firmware <FW16 installed on Hardware 750-82xx/xxx-xxx (PFC200)all versionswago_psirtDE
Firmware <FW16 installed on Hardware 762-4xxxall versionswago_psirtDE
Firmware <FW16 installed on Hardware 762-6xxxall versionswago_psirtDE
Firmware <FW16 installed on Pepperl+Fuchs Hardware 762-5xxxall versionswago_psirtDE

advisories (1)

Vendor and ecosystem advisories describing this.

VDE-2020-011WAGO: Multiple Vulnerabilities in I/O-Check Service2020-03-09csaf · wago_psirtDE
An attacker needs an authorized login on the device in order to exploit the herein mentioned vulnerabilities. The reported vulnerabilities allow a local attacker with valid login credentials who is able to create files on the device to change the devices settings, e.g. default gateway address, time server etc. and potentially execute code.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd wago_psirt NVD CVE.org MITRE

published 2020-03-12modified 2026-06-17

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+16124 more

references (4)

External citations — patches, advisories, analysis.

https://nvd.nist.gov/vuln/detail/CVE-2019-5176 cnnvd
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0963 cnnvd
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0963 enisa_euvd
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0963ExploitMitigationTechnical DescriptionThird Party Advisorynvd

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