CVE-2023-1620Network attack vector

Authenticated device crash via malformed runtime command

Published Jun 26, 2023 · Updated Nov 12, 2024

Denial of service in affected WAGO controllers allows remote authenticated users to crash devices through the CODESYS V2 runtime. The runtime command parser accepts a malformed packet without adequately validating input consistency, causing the controller to crash. High-privilege runtime access is required, and a complete restart restores operation.

CVSS severity4.9
Medium
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

Denial of service in affected WAGO controllers allows remote authenticated users to crash devices through the CODESYS V2 runtime. The runtime command parser accepts a malformed packet without adequately validating input consistency, causing the controller to crash. High-privilege runtime access is required, and a complete restart restores operation.

The record

CVE
CVE-2023-1620
Published
Jun 26, 2023
Updated
Nov 12, 2024
Vendor
WAGO
Product
WAGO BACnet MS/TP Controller 750-829
Classifications
CWE-1288, T0814
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 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=FW1 <=FW14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WAGO · WAGO BACnet MS/TP Controller 750-829version=FW1 <=FW14
WAGO · WAGO PFC200 Controller 750-8212version=FW1 <=FW22 SP1
WAGO · WAGO PFC200 Controller 750-8203version=FW1 <=FW22 SP1
WAGO · WAGO PFC200 Controller 750-8211version=FW1 <=FW22 SP1
WAGO · 750-890/xxx-xxxversion=FW1 <=FW10
WAGO · WAGO PFC200 Controller 750-8213version=FW1 <=FW22 SP1
WAGO · WAGO PFC200 Controller 750-8207version=FW1 <=FW22 SP1
WAGO · WAGO PFC200 Controller 750-8208version=FW1 <=FW22 SP1
WAGO · WAGO I/O System 750-332 BACnet/IP Fieldbus Couplerversion=FW1 <=FW6
WAGO · WAGO PFC200 Controller 750-8206version=FW1 <=FW22 SP1
WAGO · WAGO EtherNet/IP Controller 750-823version=FW1 <=FW10
WAGO · WAGO PFC200 Controller 750-8217version=FW1 <=FW22 SP1
WAGO · 750-891version=FW1 <=FW10
WAGO · WAGO PFC200 Controller 750-8210version=FW1 <=FW22 SP1
WAGO · 750-889version=FW1 <=FW16
WAGO · 750-882version=FW1 <=FW16
WAGO · WAGO I/O System 750-331 PROFIBUS DP Fieldbus Couplerversion=FW1 <=FW14
WAGO · 750-880/xxx-xxxversion=FW1 <=FW16
WAGO · WAGO PFC200 Controller 750-8204version=FW1 <=FW22 SP1
WAGO · 750-881version=FW1 <=FW16
WAGO · WAGO ETHERNET ECO Controller 750-852version=FW1 <=FW16
WAGO · WAGO PFC200 Controller 750-8214version=FW1 <=FW22 SP1
WAGO · 750-862version=FW1 <=FW10
WAGO · WAGO BACnet/IP Controller 750-831version=FW1 <=FW14
WAGO · 750-885/xxx-xxxversion=FW1 <=FW16
WAGO · WAGO PFC200 Controller 750-8216version=FW1 <=FW22 SP1
WAGO · WAGO PFC200 Controller 750-8202version=FW1 <=FW22 SP1
WAGO · WAGO BACnet/IP Controller 750-832version=FW1 <=FW6
WAGO · 750-893version=FW1 <=FW10

Published CVSS scores

4.9CERT@VDECVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1288Improper Validation of Consistency within Input
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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