CyberSecBulletin
CVE-2025-41733NVD status: Analyzed

Energy-Controlling EWIO2-M: Authentication Bypass by Primary Weakness

Published Updated By the CyberSecBulletin desk

CVE-2025-41733 is a critical-severity authentication bypass by primary weakness vulnerability in Energy-Controlling EWIO2-M from Metz-connect, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 2.2.0 as the first without the flaw, so updating Energy-Controlling EWIO2-M to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.65% chance of exploitation within 30 days, higher than 52% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Energy-Controlling EWIO2-M to 2.2.0 or a later version.
  2. Update Energy-Controlling EWIO2-M-BM to 2.2.0 or a later version.
  3. Update Ethernet-IO EWIO2-BM to 2.2.0 or a later version.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
METZ CONNECTEnergy-Controlling EWIO2-Mbefore 2.2.02.2.0
METZ CONNECTEnergy-Controlling EWIO2-M-BMbefore 2.2.02.2.0
METZ CONNECTEthernet-IO EWIO2-BMbefore 2.2.02.2.0
Metz-connectEwio2-m Firmwarebefore 2.2.02.2.0
Metz-connectEwio2-m-bm Firmwarebefore 2.2.02.2.0
Metz-connectEwio2-bm Firmwarebefore 2.2.02.2.0

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (cert.vde.com).

Official description

The commissioning wizard on the affected devices does not validate if the device is already initialized. An unauthenticated remote attacker can construct POST requests to set root credentials.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Authentication Bypass by Primary Weakness

The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

More Authentication Bypass by Primary Weakness vulnerabilities (CWE-305)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in Energy-Controlling EWIO2-M

All Energy-Controlling EWIO2-M vulnerabilities

Recent Authentication Bypass by Primary Weakness vulnerabilities

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