Security readout for executives and security teams
Plain-English summary
This is a critical Siemens industrial-control vulnerability in SIMATIC PCS neo and the User Management Component. A remote unauthenticated attacker could crash affected systems or run arbitrary code. For executives, treat exposed UMC or PCS neo environments as high-priority operational risk, especially in production or safety-adjacent networks.
Executive priority
Prioritize remediation promptly for operational technology environments. The issue enables unauthenticated remote code execution or denial of service, and affected systems may support critical industrial operations.
Technical view
CVE-2025-40795 is a stack-based buffer overflow in the integrated UMC component, tracked as CWE-121. It affects SIMATIC PCS neo V4.1, V5.0, V6.0 before V6.0 SP1 Update 1, and UMC before V2.15.1.3. CVSS 3.1 is 9.8: network reachable, low complexity, no privileges, no user interaction.
Likely exposure
Exposure is most likely where Siemens SIMATIC PCS neo or UMC services are deployed and reachable across network boundaries. Prioritize asset owners running PCS neo V4.1, V5.0, V6.0 before SP1 Update 1, or UMC before V2.15.1.3.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. However, the vulnerability is remotely reachable, unauthenticated, low complexity, and can affect confidentiality, integrity, and availability, making it attractive if exposed.
Researcher notes
Evidence is strong for affected products, weakness class, and CVSS characteristics from the CVE record and Siemens advisory reference. The supplied bundle does not provide exploit indicators, public exploit proof, or detailed workaround text beyond version-based remediation signals.
Mitigation direction
- Review Siemens SSA-722410 for product-specific remediation guidance.
- Upgrade UMC to V2.15.1.3 or later where applicable.
- Upgrade SIMATIC PCS neo V6.0 to V6.0 SP1 Update 1 or later.
- For V4.1 and V5.0, follow Siemens guidance for supported upgrade or migration paths.
- Restrict network access to UMC and PCS neo management interfaces.
Validation and detection
- Inventory SIMATIC PCS neo and UMC deployments and record exact versions.
- Identify whether UMC or PCS neo interfaces are reachable from untrusted networks.
- Confirm V6.0 systems are at SP1 Update 1 or later.
- Confirm UMC deployments are at V2.15.1.3 or later.
- Review compensating controls where immediate upgrade is not possible.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-40795 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9siemensCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——siemensVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/html/ssa-722410.htmlCVE reference, siemens
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.