Security readout for executives and security teams
Plain-English summary
This Siemens industrial networking issue can let an unauthenticated network attacker disrupt real-time PROFINET synchronization, causing a denial of service. The business concern is process availability, not data theft. Impact depends on whether affected Siemens devices are reachable on operational networks and whether firmware is below the vendor-fixed versions.
Executive priority
Treat as high priority for sites where affected Siemens devices support production availability. Prioritize reachable OT networks and systems relying on real-time synchronization, especially where outages create safety, operational, or financial impact.
Technical view
CVE-2019-10923 is a CWE-400 resource-management flaw affecting multiple Siemens PROFINET IO products. CVSS 3.1 is 7.5, network exploitable, low complexity, no privileges, no user interaction, availability-only impact. The described effect is breaking IRT synchronization in affected installations.
Likely exposure
Likely exposure is in OT environments using listed Siemens SCALANCE X-200IRT, SIMATIC CP, SIMATIC ET 200, ET200ecoPN, or PROFINET IO development kits. Risk requires network access to the affected device or installation.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The CVSS temporal vector includes proof-of-concept maturity, but no exploit details or active campaign evidence are provided.
Researcher notes
Evidence supports an availability-focused network DoS affecting Siemens PROFINET IRT synchronization. The bundle names fixed versions for several products but lists some products as all versions or version 0, so remediation status should be verified against Siemens SSA-349422.
Mitigation direction
- Upgrade affected products to the Siemens fixed versions listed in the advisory where available.
- For all-version entries, check Siemens guidance for compensating controls or replacement direction.
- Restrict network access to PROFINET and IRT-capable devices to trusted OT segments.
- Block untrusted routing into affected industrial control networks.
- Plan firmware changes through OT maintenance windows and rollback procedures.
Validation and detection
- Inventory Siemens PROFINET IO, SCALANCE, SIMATIC CP, and ET 200 assets.
- Compare firmware versions against the affected version ranges in Siemens SSA-349422.
- Confirm whether affected devices are reachable from non-OT or untrusted networks.
- Review monitoring for IRT synchronization loss or unexplained availability interruptions.
- Validate that upgraded devices report fixed firmware versions after maintenance.
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
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ATT&CK lookup starting points
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CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-10923 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe 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:N/I:N/A:H/E:P/RL:O/RC:C3.93.6Primary CVE scoreVulnerability scoring details
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/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-349422.pdfCVE reference
- https://cert-portal.siemens.com/productcert/html/ssa-349422.htmlCVE reference
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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.