Security readout for executives and security teams
Plain-English summary
This Siemens industrial-control vulnerability can let an unauthenticated network attacker knock affected controllers or CNC systems offline through port 102. Recovery requires a cold restart, so impact can translate into production downtime, maintenance intervention, and operational disruption rather than data theft.
Executive priority
Treat as high priority for production OT environments because successful exploitation can force downtime and manual recovery. Prioritize exposed or safety-critical lines first, especially where network segmentation is weak or remote access reaches controller networks.
Technical view
CVE-2020-15783 affects all versions of listed SIMATIC S7-300, related ET200/SIPLUS variants, SIMATIC TDC CPU555, and SINUMERIK 840D sl. Multiple specially crafted packets to port 102 can trigger denial of service. CVSS 3.1 is 7.5 high, with network attack vector, low complexity, no privileges, no user interaction, and availability-only impact.
Likely exposure
Exposure is most likely in industrial environments running the named Siemens controller or SINUMERIK platforms. Risk is highest where port 102 is reachable from enterprise networks, remote access paths, vendors, or untrusted segments. The source states all versions are affected for listed products.
Exploitation context
The source bundle does not show CISA KEV listing, observed active exploitation, or public exploit availability. The CVSS vector indicates remote unauthenticated reachability over the network, but exploitation status should not be assumed beyond the cited denial-of-service behavior.
Researcher notes
Evidence supports a network-triggered availability issue on Siemens industrial devices using port 102. Sources do not provide patch details in the supplied bundle. Avoid assuming compromise of confidentiality or integrity; focus validation on affected asset presence, reachability, segmentation, and vendor advisory tracking.
Mitigation direction
- Review Siemens advisory SSA-492828 for vendor-specific remediation guidance.
- Inventory affected Siemens devices and confirm product families in production.
- Restrict port 102 access to approved engineering and management hosts.
- Segment OT networks from enterprise, internet, and vendor remote access paths.
- Plan operational recovery for cold restart scenarios.
Validation and detection
- Identify assets matching the affected Siemens product families and variants.
- Verify whether port 102 is reachable from non-OT or untrusted networks.
- Confirm whether compensating network controls restrict access to engineering hosts.
- Review operational runbooks for controlled cold restart recovery.
- Track Siemens advisory status for product-specific guidance.
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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Open ATT&CK lookupCVE-2020-15783 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
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
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:H3.93.6CISA-ADPVulnerability 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
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/pdf/ssa-492828.pdfCVE reference, siemens · x_refsource_MISC
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.