SIMATIC PCS neo V4.1: Out-of-bounds Read
CVE-2025-30174 is a high-severity out-of-bounds read vulnerability in SIMATIC PCS neo V4.1 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 SIMATIC PCS neo V4.1 versions: all versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.66% chance of exploitation within 30 days, higher than 52% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update SINEC NMS to V4.0 or a later version.
- Update User Management Component (UMC) to V2.15.1.1 or a later version.
- Update User Management Component to 2.15.1.1 or a later version.
- Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | SIMATIC PCS neo V4.1 | all versions | Not stated |
| Siemens | SIMATIC PCS neo V5.0 | all versions | Not stated |
| Siemens | SINEC NMS | before V4.0 | V4.0 |
| Siemens | SINEMA Remote Connect | all versions | Not stated |
| Siemens | Totally Integrated Automation Portal (TIA Portal) V17 | all versions | Not stated |
| Siemens | Totally Integrated Automation Portal (TIA Portal) V18 | all versions | Not stated |
| Siemens | Totally Integrated Automation Portal (TIA Portal) V19 | all versions | Not stated |
| Siemens | Totally Integrated Automation Portal (TIA Portal) V20 | all versions | Not stated |
| Siemens | User Management Component (UMC) | before V2.15.1.1 | V2.15.1.1 |
| Siemens | Totally Integrated Automation Portal | 17; 18; 19; 20 | Not stated |
| Siemens | User Management Component | before 2.15.1.1 | 2.15.1.1 |
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 CNA (siemens.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA (siemens.com) |
| CVSS 3.1 | 7.5 | High | CNA (siemens.com) |
Official description
A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SINEC NMS (All versions < V4.0), SINEMA Remote Connect (All versions), Totally Integrated Automation Portal (TIA Portal) V17 (All versions), Totally Integrated Automation Portal (TIA Portal) V18 (All versions), Totally Integrated Automation Portal (TIA Portal) V19 (All versions), Totally Integrated Automation Portal (TIA Portal) V20 (All versions), User Management Component (UMC) (All versions < V2.15.1.1). Affected products contain a out of bound read buffer overflow vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to cause a denial of service condition.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in SIMATIC PCS neo V4.1
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 9.8 Critical severity
- 8.2 High severity
- 9.8 Critical severity
Recent Out-of-bounds Read vulnerabilities
- 8.4 High severity
- 7.8 High severity
- 7.5 High severity
- 9.1 Critical severity
- 7.1 High severity
- 7.1 High severity
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