Security readout for executives and security teams
Plain-English summary
This Siemens issue can let an unauthenticated remote attacker crash affected PCS neo or UMC functionality, causing denial of service. It is most urgent where these systems support production operations or are reachable from broader networks.
Executive priority
Treat as a high-priority availability risk for industrial environments. Prioritize systems supporting live operations or reachable outside tightly controlled management networks.
Technical view
CVE-2025-40798 is a CWE-125 out-of-bounds read in the integrated Siemens User Management Component. The CVSS v4.0 score is 8.7, with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is limited to Siemens SIMATIC PCS neo V4.1, V5.0, V6.0 before V6.0 SP1 Update 1, and UMC before V2.15.1.3. Risk rises if affected services are network-reachable by untrusted users.
Exploitation context
The provided sources support unauthenticated remote denial of service. They do not show confirmed active exploitation, and the CVE is not marked in KEV in the supplied bundle.
Researcher notes
The bundle identifies affected product lines and version thresholds but does not provide protocol specifics, proof-of-concept status, or detailed fixes beyond the Siemens advisory reference. Avoid assuming compromise beyond denial of service.
Mitigation direction
- Review Siemens SSA-722410 for the official remediation path.
- Update SIMATIC PCS neo V6.0 to SP1 Update 1 or later where applicable.
- Update UMC to V2.15.1.3 or later where applicable.
- For PCS neo V4.1 and V5.0, follow Siemens guidance on supported upgrade options.
- Restrict network reachability to affected Siemens management components until remediated.
Validation and detection
- Inventory SIMATIC PCS neo and UMC versions across operational environments.
- Confirm whether PCS neo V6.0 is below SP1 Update 1.
- Confirm whether standalone or integrated UMC is below V2.15.1.3.
- Check whether affected services are reachable from untrusted networks.
- Monitor affected hosts for unexpected service crashes or availability events.
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-125: 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 lookupCVE-2025-40798 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
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——siemensCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6siemensVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.