CyberSecBulletin
CVE-2022-46352NVD status: Modified

SCALANCE X204RNA (HSR): Uncontrolled Resource Consumption

Published Updated By the CyberSecBulletin desk

CVE-2022-46352 is a high-severity uncontrolled resource consumption vulnerability in SCALANCE X204RNA (HSR) from Siemens, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected SCALANCE X204RNA (HSR) versions: All versions < V3.2.7. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.71% chance of exploitation within 30 days, higher than 54% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update 6gk5204-0ba00-2mb2 Firmware to 3.2.7 or a later version.
  2. Update 6gk5204-0ba00-2kb2 Firmware to 3.2.7 or a later version.
  3. Update 6gk5204-0bs00-2na3 Firmware to 3.2.7 or a later version.
  4. Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
  5. 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
SiemensSCALANCE X204RNA (HSR)All versions < V3.2.7Not stated
SiemensSCALANCE X204RNA (PRP)All versions < V3.2.7Not stated
SiemensSCALANCE X204RNA EEC (HSR)All versions < V3.2.7Not stated
SiemensSCALANCE X204RNA EEC (PRP)All versions < V3.2.7Not stated
SiemensSCALANCE X204RNA EEC (PRP/HSR)All versions < V3.2.7Not stated
Siemens6gk5204-0ba00-2mb2 Firmwarebefore 3.2.73.2.7
Siemens6gk5204-0ba00-2kb2 Firmwarebefore 3.2.73.2.7
Siemens6gk5204-0bs00-2na3 Firmwarebefore 3.2.73.2.7
Siemens6gk5204-0bs00-3la3 Firmwarebefore 3.2.73.2.7
Siemens6gk5204-0bs00-3pa3 Firmwarebefore 3.2.73.2.7

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
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighNVD
CVSS 3.17.5HighCISA (ADP)

Official description

A vulnerability has been identified in SCALANCE X204RNA (HSR) (All versions < V3.2.7), SCALANCE X204RNA (PRP) (All versions < V3.2.7), SCALANCE X204RNA EEC (HSR) (All versions < V3.2.7), SCALANCE X204RNA EEC (PRP) (All versions < V3.2.7), SCALANCE X204RNA EEC (PRP/HSR) (All versions < V3.2.7). Specially crafted PROFINET DCP packets could cause a denial of service condition of affected products.

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

The underlying weakness: Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource.

How developers prevent this class of flaw

  • Ensure that protocols have specific limits of scale placed on them.
  • Ensure that all failures in resource allocation place the system into a safe posture.

More Uncontrolled Resource Consumption vulnerabilities (CWE-400)

Timeline

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

References

Other vulnerabilities in SCALANCE X204RNA (HSR)

All SCALANCE X204RNA (HSR) vulnerabilities

Recent Uncontrolled Resource Consumption vulnerabilities

Spotted an error? Tell us.