CVE-2019-5077

highpriority · track · 37OT risk · elevatedEPSS 0.016 · 76 %ileEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
1.64% (76th) EPSS
CVSS 8.5 · high
Is it mine?
13 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

An exploitable denial-of-service vulnerability exists in the iocheckd service ‘’I/O-Chec’’ functionality of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC 100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a denial of service, resulting in the device entering an error state where it ceases all network communications. An attacker can send unauthenticated packets to trigger this vulnerability.

01

remediations

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

No vendor fix yet; a mitigation is available.

  • MitigationI/O-CHECK Series PFC100 and Series PFC200cisa_csaf_ot

    Disable unused TCP/UDP-ports.

  • MitigationSeries PFC100cisa_csaf_ot

    Disable unused TCP/UDP-ports.

  • MitigationSeries PFC200cisa_csaf_ot

    Disable unused TCP/UDP-ports.

02

cvss

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

10.0
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.3–10

v2.08.5highAV:N/AC:L/Au:N/C:N/I:P/A:Cprimary · NVD / NIST USexploitability 10 · impact 7.8
v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.2
v3.010criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:Hsecondary · CISA US
v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-306USprimaryCWE-306US
04

affected products (13)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • ICSA-20-065-01WAGO I/O-CHECK2020-03-05icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could allow an attacker to change settings, delete the application, run remote code, cause a system crash, cause a denial-of-service condition, revert to factory settings, and overwrite MAC addresses.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otnvdNVDCVE.orgMITRE
published 2019-12-18modified 2026-06-17
09

references (8)

External citations — patches, advisories, analysis.

scry

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