CVE-2023-3634Network attack vector

Device compromise via undocumented authenticated test mode

Published Apr 16, 2026 · Updated Apr 16, 2026

Hidden functionality in all Festo MSE6-C2M, D2M, and E2M versions allows remote authenticated users to compromise device data and operation. The devices expose an authenticated test mode and additional remote functions whose supported behavior and security implications are only partly documented. Low-privileged credentials and network access to an inadequately isolated industrial network are required; successful use can disclose or alter data and disrupt operation.

CVSS severity8.8
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hidden functionality in all Festo MSE6-C2M, D2M, and E2M versions allows remote authenticated users to compromise device data and operation. The devices expose an authenticated test mode and additional remote functions whose supported behavior and security implications are only partly documented. Low-privileged credentials and network access to an inadequately isolated industrial network are required; successful use can disclose or alter data and disrupt operation.

The record

CVE
CVE-2023-3634
Published
Apr 16, 2026
Updated
Apr 16, 2026
Vendor
Festo
Product
MSE6-E2M-5000-FB43-AGD
Classifications
CWE-1242, CWE-912
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2026Record 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=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Festo · MSE6-E2M-5000-FB43-AGDversion=*
Festo · MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L5-AGDversion=*
Festo · MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L4-AGDversion=*
Festo · MSE6-E2M-5000-FB13-AGDversion=*
Festo · MSE6-C2M-5000-FB44-D-RG-BAR-AMI-AGDversion=*
Festo · MSE6-E2M-5000-FB37-AGDversion=*
Festo · MSE6-C2M-5000-FB44-D-M-RG-BAR-AMI-AGDversion=*
Festo · MSE6-D2M-5000-CBUS-S-RG-BAR-VCB-AGDversion=*
Festo · MSE6-C2M-5000-FB43-D-M-RG-BAR-M12L4-MQ1-AGDversion=*
Festo · MSE6-E2M-5000-FB44-AGDversion=*
Festo · MSE6-C2M-5000-FB43-D-M-RG-BAR-M12L5-MQ1-AGDversion=*
Festo · MSE6-E2M-5000-FB36-AGDversion=*

Published CVSS scores

8.8CERT VDECVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1242Inclusion of Undocumented Features or Chicken Bits
CWE-912Hidden Functionality

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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