CyberSecBulletin
CVE-2026-3587NVD status: Awaiting Analysis

Lean Managed Switch 852-1812: Hidden Functionality

Published Updated By the CyberSecBulletin desk

CVE-2026-3587 is a critical-severity hidden functionality vulnerability in Lean Managed Switch 852-1812 from WAGO, with a CVSS 3.1 base score of 10.0 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 V1.2.1.S0 as the first without the flaw, so updating Lean Managed Switch 852-1812 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.71% chance of exploitation within 30 days, higher than 54% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Lean Managed Switch 852-1812 to V1.2.1.S0 or a later version.
  2. Update Lean Managed Switch 852-1813 to V1.2.1.S0 or a later version.
  3. Update Lean Managed Switch 852-1813-000-001 to V1.2.3.S0 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
WAGOLean Managed Switch 852-1812before V1.2.1.S0V1.2.1.S0
WAGOLean Managed Switch 852-1813before V1.2.1.S0V1.2.1.S0
WAGOLean Managed Switch 852-1813-000-001before V1.2.3.S0V1.2.3.S0
WAGOLean Managed Switch 852-1816before V1.2.1.S0V1.2.1.S0
WAGOIndustrial Managed Switch 852-303before V1.2.8.S0V1.2.8.S0
WAGOIndustrial Managed Switch 852-1305before V1.2.0.S0V1.2.0.S0
WAGOIndustrial Managed Switch 852-1305-000-001before V1.2.0.S0V1.2.0.S0
WAGOIndustrial Managed Switch 852-1505-000-001before V1.2.0.S0V1.2.0.S0
WAGOIndustrial Managed Switch 852-1505before V1.1.9.S0V1.1.9.S0
WAGOIndustrial Managed Switch 852-602before V1.0.6.S0V1.0.6.S0
WAGOIndustrial Managed Switch 852-603before V1.0.6.S0V1.0.6.S0
WAGOIndustrial Managed Switch 852-1605before V1.2.5.S0V1.2.5.S0
WAGOLean Managed Switch 852-1812-010-000before V1.2.1.S0V1.2.1.S0
WAGOLean Managed Switch 852-1813-010-000before V1.2.1.S0V1.2.1.S0
WAGOLean Managed Switch 852-1816-010-000before V1.2.1.S0V1.2.1.S0
WAGOLean Managed Switch 852-1813/010-001before V1.2.1.S0V1.2.1.S0

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
ChangedThe attack can reach beyond the vulnerable component into other systems.
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:C/C:H/I:H/A:H. Scored by CNA (cert.vde.com).

Official description

An unauthenticated remote attacker can exploit a hidden function in the CLI prompt to escape the restricted interface, leading to full compromise of the device.

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

The underlying weakness: Hidden Functionality

The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators.

How developers prevent this class of flaw

  • Always verify the integrity of the product that is being installed.

More Hidden Functionality vulnerabilities (CWE-912)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Hidden Functionality vulnerabilities

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