CVE-2021-34569Network attack vector

Memory corruption via crafted diagnostic service packets

Published Nov 9, 2022 · Updated May 1, 2025

Out-of-bounds write in WAGO I/O-Check Service through FW18 Patch 2 allows remote attackers to corrupt memory with a crafted packet. The service processes a specially crafted packet containing OS commands and writes beyond its intended memory boundary; no finer parser or function detail is public. No authentication or user interaction is required, and exploitation can crash the diagnostic tool or manipulate the device.

CVSS severity9.8
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in WAGO I/O-Check Service through FW18 Patch 2 allows remote attackers to corrupt memory with a crafted packet. The service processes a specially crafted packet containing OS commands and writes beyond its intended memory boundary; no finer parser or function detail is public. No authentication or user interaction is required, and exploitation can crash the diagnostic tool or manipulate the device.

The record

CVE
CVE-2021-34569
Published
Nov 9, 2022
Updated
May 1, 2025
Vendor
WAGO
Product
Edge Controller 0752-8303/8000-0002
Classifications
CWE-787, CAPEC-123, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 2022CVE publishedPublication date reported by the CVE source.
  2. May 1, 2025Record 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=FW1 <=FW18 Patch 2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WAGO · Edge Controller 0752-8303/8000-0002version=FW1 <=FW18 Patch 2
WAGO · PFC200 Controllerversion=FW1 <=FW18 Patch 2
WAGO · Touch Panel 600 Advanced Lineversion=FW1 <=FW18 Patch 2
WAGO · Touch Panel 600 Marine Lineversion=FW1 <=FW18 Patch 2
WAGO · Touch Panel 600 Standard Lineversion=FW1 <=FW18 Patch 2
WAGO · PFC100 Controllerversion=FW1 <=FW18 Patch 2

Published CVSS scores

9.8CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CAPEC-123Buffer Manipulation
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

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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